diff --git a/lib/gollum/markup.rb b/lib/gollum/markup.rb
index 80a0b256..339617b8 100644
--- a/lib/gollum/markup.rb
+++ b/lib/gollum/markup.rb
@@ -381,6 +381,12 @@ module Gollum
     #
     #########################################################################
 
+    # Extract all sequence diagram blocks into the wsdmap and replace with 
+    # placeholders.
+    #
+    # data - The raw String data.
+    #
+    # Returns the placeholder'd String data.
     def extract_wsd(data)
       data.gsub(/^\{\{\{ ?(.+?)\r?\n(.+?)\r?\n\}\}\}\r?$/m) do
         id = Digest::SHA1.hexdigest($2)
@@ -389,6 +395,12 @@ module Gollum
       end
     end
 
+    # Process all diagrams from the wsdmap and replace the placeholders with 
+    # the final HTML.
+    #
+    # data - The String data (with placeholders).
+    #
+    # Returns the marked up String data.
     def process_wsd(data)
       @wsdmap.each do |id, spec|
         style = spec[:style]
diff --git a/lib/gollum/websequencediagram.rb b/lib/gollum/websequencediagram.rb
index 37dbc356..fd549c57 100644
--- a/lib/gollum/websequencediagram.rb
+++ b/lib/gollum/websequencediagram.rb
@@ -5,6 +5,12 @@ require 'open-uri'
 class Gollum::WebSequenceDiagram
   WSD_URL = "http://www.websequencediagrams.com/index.php"
 
+  # Initialize a new WebSequenceDiagram object.
+  #
+  # code  - The String containing the sequence diagram markup.
+  # style - The String containing the rendering style.
+  #
+  # Returns a new Gollum::WebSequenceDiagram object
   def initialize(code, style)
     @code = code
     @style = style
@@ -13,6 +19,10 @@ class Gollum::WebSequenceDiagram
     render
   end
 
+  # Render the sequence diagram on the remote server and store the url to
+  # the rendered image.
+  #
+  # Returns nil.
   def render
     response = Net::HTTP.post_form(URI.parse(WSD_URL), 'style' => @style, 'message' => @code)
     if response.body =~ /img: "(.+)"/
@@ -24,6 +34,9 @@ class Gollum::WebSequenceDiagram
     end
   end
 
+  # Gets the HTML IMG tag for the sequence diagram.
+  #
+  # Returns a String containing the IMG tag.
   def to_tag
     @tag
   end