diff --git a/supernotelib/__init__.py b/supernotelib/__init__.py
index d70f6b2..47d980a 100644
--- a/supernotelib/__init__.py
+++ b/supernotelib/__init__.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = '0.5.0'
+__version__ = '0.5.1'
 
 from . import color
 from . import converter
diff --git a/supernotelib/cmds/supernote_tool.py b/supernotelib/cmds/supernote_tool.py
index efbf115..feb912c 100755
--- a/supernotelib/cmds/supernote_tool.py
+++ b/supernotelib/cmds/supernote_tool.py
@@ -77,6 +77,7 @@ def save(svg, file_name):
 def convert_to_pdf(args, notebook, palette):
     vectorize = args.pdf_type == 'vector'
     use_link = not args.no_link
+    use_keyword = args.add_keyword
     converter = PdfConverter(notebook, palette=palette)
     def save(data, file_name):
         if data is not None:
@@ -85,10 +86,10 @@ def save(data, file_name):
         else:
             print('no data')
     if args.all:
-        data = converter.convert(-1, vectorize, enable_link=use_link) # minus value means converting all pages
+        data = converter.convert(-1, vectorize, enable_link=use_link, enable_keyword=use_keyword) # minus value means converting all pages
         save(data, args.output)
     else:
-        data = converter.convert(args.number, vectorize, enable_link=use_link)
+        data = converter.convert(args.number, vectorize, enable_link=use_link, enable_keyword=use_keyword)
         save(data, args.output)
 
 def convert_to_txt(args, notebook, palette):
@@ -183,6 +184,7 @@ def main():
     parser_convert.add_argument('--exclude-background', action='store_true', default=False, help='exclude background and make it transparent (PNG and SVG are supported)')
     parser_convert.add_argument('--pdf-type', choices=['original', 'vector'], default='original', help='select PDF conversion type')
     parser_convert.add_argument('--no-link', action='store_true', default=False, help='disable links in PDF')
+    parser_convert.add_argument('--add-keyword', action='store_true', default=False, help='enable keywords in PDF')
     parser_convert.add_argument('--policy', choices=['strict', 'loose'], default='strict', help='select parser policy')
     parser_convert.set_defaults(handler=subcommand_convert)
 
diff --git a/supernotelib/converter.py b/supernotelib/converter.py
index 69f20a3..a28a297 100644
--- a/supernotelib/converter.py
+++ b/supernotelib/converter.py
@@ -307,7 +307,7 @@ def __init__(self, notebook, palette=None):
         self.palette = palette
         self.pagesize = A4
 
-    def convert(self, page_number, vectorize=False, enable_link=False):
+    def convert(self, page_number, vectorize=False, enable_link=False, enable_keyword=False):
         """Returns PDF data of the given page.
 
         Parameters
@@ -318,6 +318,8 @@ def convert(self, page_number, vectorize=False, enable_link=False):
             convert handwriting to vector
         enable_link : bool
             enable page links and web links
+        enable_keyword : bool
+            enable page link where keyword has been identified
 
         Returns
         -------
@@ -332,7 +334,7 @@ def convert(self, page_number, vectorize=False, enable_link=False):
             renderer_class = PdfConverter.ImgPageRenderer
         imglist = self._create_image_list(converter, page_number)
         pdf_data = BytesIO()
-        self._create_pdf(pdf_data, imglist, renderer_class, enable_link)
+        self._create_pdf(pdf_data, imglist, renderer_class, enable_link, enable_keyword)
         return pdf_data.getvalue()
 
     def _create_image_list(self, converter, page_number):
@@ -348,15 +350,29 @@ def _create_image_list(self, converter, page_number):
             imglist.append(img)
         return imglist
 
-    def _create_pdf(self, buf, imglist, renderer_class, enable_link):
+    def _create_pdf(self, buf, imglist, renderer_class, enable_link, enable_keyword):
         c = canvas.Canvas(buf, pagesize=self.pagesize)
+        keywords = self.note.get_keywords()
         for n, img in enumerate(imglist):
             page = self.note.get_page(n)
+            pageid = page.get_pageid()
             horizontal = page.get_orientation() == fileformat.Page.ORIENTATION_HORIZONTAL
             pagesize = landscape(self.pagesize) if horizontal else portrait(self.pagesize)
             c.setPageSize(pagesize)
             renderer = renderer_class(img, pagesize)
             renderer.draw(c)
+            if enable_keyword:
+                found = []
+                for keyword in keywords:
+                    if keyword.get_page_number() == n:
+                        found.append(keyword)
+                for i in found:
+                    try:
+                        c.bookmarkPage(pageid)
+                        scaled_rect = self._calc_link_rect(i.get_rect(), renderer.get_scale())
+                        c.textAnnotation(i.get_keyword(),scaled_rect)
+                    except:
+                        continue
             if enable_link:
                 pageid = page.get_pageid()
                 if pageid is not None:
@@ -449,3 +465,4 @@ def convert(self, page_number):
         if text_list is None:
             return None
         return ' '.join(text_list)
+    
\ No newline at end of file
diff --git a/supernotelib/fileformat.py b/supernotelib/fileformat.py
index 832287e..b78c353 100644
--- a/supernotelib/fileformat.py
+++ b/supernotelib/fileformat.py
@@ -210,6 +210,13 @@ def get_page_number(self):
 
     def get_position(self):
         return self.position
+    
+    def get_keyword(self):
+        return None if self.metadata['KEYWORD'] is None else str(self.metadata['KEYWORD'])
+    
+    def get_rect(self):
+        (left, top, width, height) = self.metadata['KEYWORDRECT'].split(',')
+        return (int(left), int(top), int(left) + int(width), int(top) + int(height))
 
 class Title:
     def __init__(self, title_info):