diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG
index 9ea01ada2e6df512825801b0ac2b17246aa80cca..26286cecfb9842a448d9879bd9bef3819bebb9f0 100644
--- a/activesupport/CHANGELOG
+++ b/activesupport/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Expose methods added to Enumerable in the documentation, such as group_by. Closes #6170. [sergeykojin@gmail.com, Marcel Molina Jr.]
+
 * Ensure Chars#tidy_bytes only tidies broken bytes. Closes #6397 [Manfred Stienstra]
 
 * Add 'unloadable', a method used to mark any constant as requiring an unload after each request. [Nicholas Seckar]
diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb
index 59128007df35d41b5264f5c6e3e20fb92c37eff8..93372bb4d5fa5064dd691a65b61a292db4baebda 100644
--- a/activesupport/lib/active_support/core_ext/enumerable.rb
+++ b/activesupport/lib/active_support/core_ext/enumerable.rb
@@ -1,4 +1,4 @@
-module Enumerable #:nodoc:
+module Enumerable
   # Collect an enumerable into sets, grouped by the result of a block. Useful,
   # for example, for grouping records by date.
   #
@@ -19,7 +19,7 @@ def group_by
       (groups[yield(element)] ||= []) << element
       groups
     end
-  end 
+  end if RUBY_VERSION < '1.9'
 
   # Calculates a sum from the elements. Examples:
   #