diff --git a/.document b/.document
new file mode 100644
index 0000000..1d07bdf
--- /dev/null
+++ b/.document
@@ -0,0 +1,5 @@
+BSDL
+COPYING
+README.md
+docs/
+lib/
diff --git a/.rdoc_options b/.rdoc_options
new file mode 100644
index 0000000..f9297d9
--- /dev/null
+++ b/.rdoc_options
@@ -0,0 +1,2 @@
+---
+main_page: README.md
diff --git a/docs/kernel.rb b/docs/kernel.rb
new file mode 100644
index 0000000..2e2dbad
--- /dev/null
+++ b/docs/kernel.rb
@@ -0,0 +1,3 @@
+# Built-in module
+module Kernel
+end
diff --git a/lib/pp.rb b/lib/pp.rb
index 3e7b077..2cf0045 100644
--- a/lib/pp.rb
+++ b/lib/pp.rb
@@ -63,6 +63,7 @@
 
 class PP < PrettyPrint
 
+  # The version string
   VERSION = "0.6.1"
 
   # Returns the usable width for +out+.
@@ -138,6 +139,7 @@ class << self
     end
   end
 
+  # Module that defines helper methods for pretty_print.
   module PPMethods
 
     # Yields to a block
@@ -619,7 +621,7 @@ def pretty_print(q) # :nodoc:
 end
 
 if defined?(RubyVM::AbstractSyntaxTree)
-  class RubyVM::AbstractSyntaxTree::Node
+  class RubyVM::AbstractSyntaxTree::Node # :nodoc:
     def pretty_print_children(q, names = [])
       children.zip(names) do |c, n|
         if n