diff --git a/.document b/.document
new file mode 100644
index 0000000..7f60f8e
--- /dev/null
+++ b/.document
@@ -0,0 +1,3 @@
+README.md
+ext/date/*.[ch]
+lib/date.rb
diff --git a/date.gemspec b/date.gemspec
index cf07696..eecbf78 100644
--- a/date.gemspec
+++ b/date.gemspec
@@ -12,6 +12,7 @@ Gem::Specification.new do |s|
 
   s.require_path = %w{lib}
   s.files = [
+    "README.md",
     "lib/date.rb", "ext/date/date_core.c", "ext/date/date_parse.c", "ext/date/date_strftime.c",
     "ext/date/date_strptime.c", "ext/date/date_tmx.h", "ext/date/extconf.rb", "ext/date/prereq.mk",
     "ext/date/zonetab.h", "ext/date/zonetab.list"
diff --git a/ext/date/date_core.c b/ext/date/date_core.c
index eabdbe1..c365dad 100644
--- a/ext/date/date_core.c
+++ b/ext/date/date_core.c
@@ -465,6 +465,7 @@ c_find_ldoy(int y, double sg, int *rjd, int *ns)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static int
 c_find_fdom(int y, int m, double sg, int *rjd, int *ns)
 {
@@ -621,6 +622,7 @@ c_jd_to_weeknum(int jd, int f, double sg, int *ry, int *rw, int *rd)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static void
 c_nth_kday_to_jd(int y, int m, int n, int k, double sg, int *rjd, int *ns)
 {
@@ -646,6 +648,7 @@ c_jd_to_wday(int jd)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static void
 c_jd_to_nth_kday(int jd, double sg, int *ry, int *rm, int *rn, int *rk)
 {
@@ -822,6 +825,7 @@ c_valid_weeknum_p(int y, int w, int d, int f, double sg,
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static int
 c_valid_nth_kday_p(int y, int m, int n, int k, double sg,
 		   int *rm, int *rn, int *rk, int *rjd, int *ns)
@@ -963,6 +967,7 @@ ns_to_day(VALUE n)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 ms_to_sec(VALUE m)
 {
@@ -981,6 +986,7 @@ ns_to_sec(VALUE n)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 inline static VALUE
 ins_to_day(int n)
 {
@@ -1016,6 +1022,7 @@ day_to_sec(VALUE d)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 day_to_ns(VALUE d)
 {
@@ -1040,6 +1047,7 @@ sec_to_ns(VALUE s)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 isec_to_ns(int s)
 {
@@ -1066,6 +1074,7 @@ div_df(VALUE d, VALUE *f)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 div_sf(VALUE s, VALUE *f)
 {
@@ -1500,6 +1509,7 @@ m_df(union DateData *x)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 m_df_in_day(union DateData *x)
 {
@@ -1997,6 +2007,7 @@ expect_numeric(VALUE x)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static void
 civil_to_jd(VALUE y, int m, int d, double sg,
 	    VALUE *nth, int *ry,
@@ -2309,6 +2320,7 @@ valid_weeknum_p(VALUE y, int w, int d, int f, double sg,
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static int
 valid_nth_kday_p(VALUE y, int m, int n, int k, double sg,
 		 VALUE *nth, int *ry,
@@ -2446,6 +2458,7 @@ valid_jd_sub(int argc, VALUE *argv, VALUE klass, int need_jd)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 date_s__valid_jd_p(int argc, VALUE *argv, VALUE klass)
 {
@@ -2535,6 +2548,7 @@ valid_civil_sub(int argc, VALUE *argv, VALUE klass, int need_jd)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 date_s__valid_civil_p(int argc, VALUE *argv, VALUE klass)
 {
@@ -2626,6 +2640,7 @@ valid_ordinal_sub(int argc, VALUE *argv, VALUE klass, int need_jd)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 date_s__valid_ordinal_p(int argc, VALUE *argv, VALUE klass)
 {
@@ -2712,6 +2727,7 @@ valid_commercial_sub(int argc, VALUE *argv, VALUE klass, int need_jd)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 date_s__valid_commercial_p(int argc, VALUE *argv, VALUE klass)
 {
@@ -2773,6 +2789,7 @@ date_s_valid_commercial_p(int argc, VALUE *argv, VALUE klass)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 valid_weeknum_sub(int argc, VALUE *argv, VALUE klass, int need_jd)
 {
@@ -2804,6 +2821,7 @@ valid_weeknum_sub(int argc, VALUE *argv, VALUE klass, int need_jd)
     }
 }
 
+/* :nodoc: */
 static VALUE
 date_s__valid_weeknum_p(int argc, VALUE *argv, VALUE klass)
 {
@@ -2824,6 +2842,7 @@ date_s__valid_weeknum_p(int argc, VALUE *argv, VALUE klass)
     return valid_weeknum_sub(5, argv2, klass, 1);
 }
 
+/* :nodoc: */
 static VALUE
 date_s_valid_weeknum_p(int argc, VALUE *argv, VALUE klass)
 {
@@ -2875,6 +2894,7 @@ valid_nth_kday_sub(int argc, VALUE *argv, VALUE klass, int need_jd)
     }
 }
 
+/* :nodoc: */
 static VALUE
 date_s__valid_nth_kday_p(int argc, VALUE *argv, VALUE klass)
 {
@@ -2895,6 +2915,7 @@ date_s__valid_nth_kday_p(int argc, VALUE *argv, VALUE klass)
     return valid_nth_kday_sub(5, argv2, klass, 1);
 }
 
+/* :nodoc: */
 static VALUE
 date_s_valid_nth_kday_p(int argc, VALUE *argv, VALUE klass)
 {
@@ -2917,6 +2938,7 @@ date_s_valid_nth_kday_p(int argc, VALUE *argv, VALUE klass)
     return Qtrue;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_zone_to_diff(VALUE klass, VALUE str)
 {
@@ -3112,6 +3134,7 @@ old_to_new(VALUE ajd, VALUE of, VALUE sg,
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 date_s_new_bang(int argc, VALUE *argv, VALUE klass)
 {
@@ -3623,6 +3646,7 @@ date_s_commercial(int argc, VALUE *argv, VALUE klass)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 date_s_weeknum(int argc, VALUE *argv, VALUE klass)
 {
@@ -3672,6 +3696,7 @@ date_s_weeknum(int argc, VALUE *argv, VALUE klass)
     return ret;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_nth_kday(int argc, VALUE *argv, VALUE klass)
 {
@@ -4471,10 +4496,10 @@ date_s__parse_internal(int argc, VALUE *argv, VALUE klass)
  * Parses the given representation of date and time, and returns a
  * hash of parsed elements.
  *
- * This method *does not* function as a validator.  If the input
+ * This method *does* *not* function as a validator.  If the input
  * string does not match valid formats strictly, you may get a cryptic
- * result.  Should consider to use `Date._strptime` or
- * `DateTime._strptime` instead of this method as possible.
+ * result.  Should consider to use Date._strptime or DateTime._strptime
+ * instead of this method as possible.
  *
  * If the optional second argument is true and the detected year is in
  * the range "00" to "99", considers the year a 2-digit form and makes
@@ -4483,8 +4508,8 @@ date_s__parse_internal(int argc, VALUE *argv, VALUE klass)
  *    Date._parse('2001-02-03')	#=> {:year=>2001, :mon=>2, :mday=>3}
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 date_s__parse(int argc, VALUE *argv, VALUE klass)
@@ -4499,10 +4524,10 @@ date_s__parse(int argc, VALUE *argv, VALUE klass)
  * Parses the given representation of date and time, and creates a
  * date object.
  *
- * This method *does not* function as a validator.  If the input
+ * This method *does* *not* function as a validator.  If the input
  * string does not match valid formats strictly, you may get a cryptic
- * result.  Should consider to use `Date.strptime` instead of this
- * method as possible.
+ * result.  Should consider to use Date.strptime instead of this method
+ * as possible.
  *
  * If the optional second argument is true and the detected year is in
  * the range "00" to "99", considers the year a 2-digit form and makes
@@ -4513,8 +4538,8 @@ date_s__parse(int argc, VALUE *argv, VALUE klass)
  *    Date.parse('3rd Feb 2001')	#=> #<Date: 2001-02-03 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  *
  * See argument {start}[rdoc-ref:Date@Argument+start].
  */
@@ -4560,8 +4585,8 @@ VALUE date__jisx0301(VALUE);
  * Returns a hash of parsed elements.
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 date_s__iso8601(int argc, VALUE *argv, VALUE klass)
@@ -4586,8 +4611,8 @@ date_s__iso8601(int argc, VALUE *argv, VALUE klass)
  *    Date.iso8601('2001-W05-6')	#=> #<Date: 2001-02-03 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  *
  * See argument {start}[rdoc-ref:Date@Argument+start].
  */
@@ -4623,8 +4648,8 @@ date_s_iso8601(int argc, VALUE *argv, VALUE klass)
  * Returns a hash of parsed elements.
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 date_s__rfc3339(int argc, VALUE *argv, VALUE klass)
@@ -4647,8 +4672,8 @@ date_s__rfc3339(int argc, VALUE *argv, VALUE klass)
  *    Date.rfc3339('2001-02-03T04:05:06+07:00')	#=> #<Date: 2001-02-03 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  *
  * See argument {start}[rdoc-ref:Date@Argument+start].
  */
@@ -4684,8 +4709,8 @@ date_s_rfc3339(int argc, VALUE *argv, VALUE klass)
  * Returns a hash of parsed elements.
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 date_s__xmlschema(int argc, VALUE *argv, VALUE klass)
@@ -4708,8 +4733,8 @@ date_s__xmlschema(int argc, VALUE *argv, VALUE klass)
  *    Date.xmlschema('2001-02-03')	#=> #<Date: 2001-02-03 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  *
  * See argument {start}[rdoc-ref:Date@Argument+start].
  *
@@ -4746,8 +4771,8 @@ date_s_xmlschema(int argc, VALUE *argv, VALUE klass)
  * Returns a hash of parsed elements.
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  *
  * Date._rfc822 is an alias for Date._rfc2822.
  */
@@ -4773,8 +4798,8 @@ date_s__rfc2822(int argc, VALUE *argv, VALUE klass)
  *						#=> #<Date: 2001-02-03 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  *
  * See argument {start}[rdoc-ref:Date@Argument+start].
  *
@@ -4811,8 +4836,8 @@ date_s_rfc2822(int argc, VALUE *argv, VALUE klass)
  * Returns a hash of parsed elements.
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 date_s__httpdate(int argc, VALUE *argv, VALUE klass)
@@ -4836,8 +4861,8 @@ date_s__httpdate(int argc, VALUE *argv, VALUE klass)
  *						#=> #<Date: 2001-02-03 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  *
  * See argument {start}[rdoc-ref:Date@Argument+start].
  *
@@ -4873,8 +4898,8 @@ date_s_httpdate(int argc, VALUE *argv, VALUE klass)
  * Returns a hash of parsed elements.
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 date_s__jisx0301(int argc, VALUE *argv, VALUE klass)
@@ -4901,8 +4926,8 @@ date_s__jisx0301(int argc, VALUE *argv, VALUE klass)
  *    Date.jisx0301('13.02.03') 		#=> #<Date: 2001-02-03 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  *
  * See argument {start}[rdoc-ref:Date@Argument+start].
  *
@@ -5097,6 +5122,7 @@ d_lite_initialize_copy(VALUE copy, VALUE date)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 d_lite_fill(VALUE self)
 {
@@ -5342,6 +5368,7 @@ d_lite_cwday(VALUE self)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 d_lite_wnum0(VALUE self)
 {
@@ -5349,6 +5376,7 @@ d_lite_wnum0(VALUE self)
     return INT2FIX(m_wnum0(dat));
 }
 
+/* :nodoc: */
 static VALUE
 d_lite_wnum1(VALUE self)
 {
@@ -5465,6 +5493,7 @@ d_lite_saturday_p(VALUE self)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 d_lite_nth_kday_p(VALUE self, VALUE n, VALUE k)
 {
@@ -6827,6 +6856,7 @@ d_lite_to_s(VALUE self)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 mk_inspect_raw(union DateData *x, VALUE klass)
 {
@@ -6876,6 +6906,7 @@ mk_inspect_raw(union DateData *x, VALUE klass)
     }
 }
 
+/* :nodoc: */
 static VALUE
 d_lite_inspect_raw(VALUE self)
 {
@@ -7251,6 +7282,7 @@ d_lite_jisx0301(VALUE self)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 d_lite_marshal_dump_old(VALUE self)
 {
@@ -7537,6 +7569,9 @@ datetime_s_ordinal(int argc, VALUE *argv, VALUE klass)
     return ret;
 }
 
+/*
+ * Same as DateTime.new.
+ */
 static VALUE
 datetime_s_civil(int argc, VALUE *argv, VALUE klass)
 {
@@ -7725,6 +7760,7 @@ datetime_s_commercial(int argc, VALUE *argv, VALUE klass)
 }
 
 #ifndef NDEBUG
+/* :nodoc: */
 static VALUE
 datetime_s_weeknum(int argc, VALUE *argv, VALUE klass)
 {
@@ -7794,6 +7830,7 @@ datetime_s_weeknum(int argc, VALUE *argv, VALUE klass)
     return ret;
 }
 
+/* :nodoc: */
 static VALUE
 datetime_s_nth_kday(int argc, VALUE *argv, VALUE klass)
 {
@@ -8139,9 +8176,9 @@ datetime_s_strptime(int argc, VALUE *argv, VALUE klass)
  * Parses the given representation of date and time, and creates a
  * DateTime object.
  *
- * This method *does not* function as a validator.  If the input
+ * This method *does* *not* function as a validator.  If the input
  * string does not match valid formats strictly, you may get a cryptic
- * result.  Should consider to use `DateTime.strptime` instead of this
+ * result.  Should consider to use DateTime.strptime instead of this
  * method as possible.
  *
  * If the optional second argument is true and the detected year is in
@@ -8155,8 +8192,8 @@ datetime_s_strptime(int argc, VALUE *argv, VALUE klass)
  *				#=> #<DateTime: 2001-02-03T16:05:06+00:00 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 datetime_s_parse(int argc, VALUE *argv, VALUE klass)
@@ -8202,8 +8239,8 @@ datetime_s_parse(int argc, VALUE *argv, VALUE klass)
  *				#=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 datetime_s_iso8601(int argc, VALUE *argv, VALUE klass)
@@ -8242,8 +8279,8 @@ datetime_s_iso8601(int argc, VALUE *argv, VALUE klass)
  *				#=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 datetime_s_rfc3339(int argc, VALUE *argv, VALUE klass)
@@ -8282,8 +8319,8 @@ datetime_s_rfc3339(int argc, VALUE *argv, VALUE klass)
  *				#=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 datetime_s_xmlschema(int argc, VALUE *argv, VALUE klass)
@@ -8323,8 +8360,8 @@ datetime_s_xmlschema(int argc, VALUE *argv, VALUE klass)
  *				#=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 datetime_s_rfc2822(int argc, VALUE *argv, VALUE klass)
@@ -8363,8 +8400,8 @@ datetime_s_rfc2822(int argc, VALUE *argv, VALUE klass)
  *				#=> #<DateTime: 2001-02-03T04:05:06+00:00 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 datetime_s_httpdate(int argc, VALUE *argv, VALUE klass)
@@ -8408,8 +8445,8 @@ datetime_s_httpdate(int argc, VALUE *argv, VALUE klass)
  *				#=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
  *
  * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing `limit: nil`, but note that
- * it may take a long time to parse.
+ * You can stop this check by passing <code>limit: nil</code>, but note
+ * that it may take a long time to parse.
  */
 static VALUE
 datetime_s_jisx0301(int argc, VALUE *argv, VALUE klass)
@@ -8799,6 +8836,7 @@ datetime_to_datetime(VALUE self)
 #define MIN_JD -327
 #define MAX_JD 366963925
 
+/* :nodoc: */
 static int
 test_civil(int from, int to, double sg)
 {
@@ -8819,6 +8857,7 @@ test_civil(int from, int to, double sg)
     return 1;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_test_civil(VALUE klass)
 {
@@ -8839,6 +8878,7 @@ date_s_test_civil(VALUE klass)
     return Qtrue;
 }
 
+/* :nodoc: */
 static int
 test_ordinal(int from, int to, double sg)
 {
@@ -8859,6 +8899,7 @@ test_ordinal(int from, int to, double sg)
     return 1;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_test_ordinal(VALUE klass)
 {
@@ -8879,6 +8920,7 @@ date_s_test_ordinal(VALUE klass)
     return Qtrue;
 }
 
+/* :nodoc: */
 static int
 test_commercial(int from, int to, double sg)
 {
@@ -8899,6 +8941,7 @@ test_commercial(int from, int to, double sg)
     return 1;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_test_commercial(VALUE klass)
 {
@@ -8919,6 +8962,7 @@ date_s_test_commercial(VALUE klass)
     return Qtrue;
 }
 
+/* :nodoc: */
 static int
 test_weeknum(int from, int to, int f, double sg)
 {
@@ -8939,6 +8983,7 @@ test_weeknum(int from, int to, int f, double sg)
     return 1;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_test_weeknum(VALUE klass)
 {
@@ -8963,6 +9008,7 @@ date_s_test_weeknum(VALUE klass)
     return Qtrue;
 }
 
+/* :nodoc: */
 static int
 test_nth_kday(int from, int to, double sg)
 {
@@ -8983,6 +9029,7 @@ test_nth_kday(int from, int to, double sg)
     return 1;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_test_nth_kday(VALUE klass)
 {
@@ -9003,6 +9050,7 @@ date_s_test_nth_kday(VALUE klass)
     return Qtrue;
 }
 
+/* :nodoc: */
 static int
 test_unit_v2v(VALUE i,
 	      VALUE (* conv1)(VALUE),
@@ -9014,6 +9062,7 @@ test_unit_v2v(VALUE i,
     return f_eqeq_p(o, i);
 }
 
+/* :nodoc: */
 static int
 test_unit_v2v_iter2(VALUE (* conv1)(VALUE),
 		    VALUE (* conv2)(VALUE))
@@ -9045,6 +9094,7 @@ test_unit_v2v_iter2(VALUE (* conv1)(VALUE),
     return 1;
 }
 
+/* :nodoc: */
 static int
 test_unit_v2v_iter(VALUE (* conv1)(VALUE),
 		   VALUE (* conv2)(VALUE))
@@ -9056,6 +9106,7 @@ test_unit_v2v_iter(VALUE (* conv1)(VALUE),
     return 1;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_test_unit_conv(VALUE klass)
 {
@@ -9070,6 +9121,7 @@ date_s_test_unit_conv(VALUE klass)
     return Qtrue;
 }
 
+/* :nodoc: */
 static VALUE
 date_s_test_all(VALUE klass)
 {
@@ -9368,6 +9420,8 @@ Init_date_core(void)
      *
      */
     cDate = rb_define_class("Date", rb_cObject);
+
+    /* Exception for invalid date/time */
     eDateError = rb_define_class_under(cDate, "Error", rb_eArgError);
 
     rb_include_module(cDate, rb_mComparable);
diff --git a/lib/date.rb b/lib/date.rb
index 5770187..88984d7 100644
--- a/lib/date.rb
+++ b/lib/date.rb
@@ -6,6 +6,10 @@
 class Date
   VERSION = '3.2.2' # :nodoc:
 
+  # call-seq:
+  #   infinite? -> false
+  #
+  # Returns +false+
   def infinite?
     false
   end