diff --git a/lib/linguist/tokenizer.rb b/lib/linguist/tokenizer.rb
index 829c64f5..4e641667 100644
--- a/lib/linguist/tokenizer.rb
+++ b/lib/linguist/tokenizer.rb
@@ -5,22 +5,35 @@ module Linguist
   # It strips any data strings or comments and preserves significant
   # language symbols.
   class Tokenizer
+    # Public: Initialize a Tokenizer.
+    #
+    # data - String data to scan.
     def initialize(data)
       @data = data
     end
 
-    # Get source data.
+    # Public: Get source data.
     #
     # Returns String.
     attr_reader :data
 
-    # Extract tokens from data.
+    # Public: Extract tokens from data.
     #
-    # Returns Array of Strings.
+    # Returns Array of token Strings.
     def tokens
       extract_tokens(data)
     end
 
+    # Internal: Extract generic tokens from data.
+    #
+    # data - String to scan.
+    #
+    # Examples
+    #
+    #   extract_tokens("printf('Hello')")
+    #   # => ['printf', '(', ')']
+    #
+    # Returns Array of token Strings.
     def extract_tokens(data)
       s = StringScanner.new(data)
 
@@ -54,6 +67,7 @@ module Linguist
           s.skip_until(/-->/)
           tokens << "-->"
 
+        # Skip single or double quoted strings
         elsif s.scan(/"/)
           s.skip_until(/[^\\]"/)
         elsif s.scan(/'/)
@@ -79,18 +93,31 @@ module Linguist
       tokens
     end
 
+    # Internal: Extract tokens from inside SGML tag.
+    #
+    # data - SGML tag String.
+    #
+    # Examples
+    #
+    #   extract_sgml_tokens("<a href='' class=foo>")
+    #   # => ["<a>", "href="]
+    #
+    # Returns Array of token Strings.
     def extract_sgml_tokens(data)
       s = StringScanner.new(data)
 
       tokens = []
 
       until s.eos?
+        # Emit start token
         if token = s.scan(/<\/?[^\s>]+/)
           tokens << "#{token}>"
 
+        # Emit attributes with trailing =
         elsif token = s.scan(/\w+=/)
           tokens << token
 
+          # Then skip over attribute value
           if s.scan(/"/)
             s.skip_until(/[^\\]"/)
           elsif s.scan(/'/)
@@ -99,9 +126,11 @@ module Linguist
             s.skip_until(/\w+/)
           end
 
+        # Emit lone attributes
         elsif token = s.scan(/\w+/)
           tokens << token
 
+        # Stop at the end of the tag
         elsif s.scan(/>/)
           s.terminate