diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index f749a09f5549f191bca165b8b8231adbe1c86876..5ec106eb8e5b5fe5cde687e18a97f138c46eb48f 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Document the :xhr option for verifications. #3666 [leeo]
+
 * Added :only and :except controls to skip_before/after_filter just like for when you add filters [DHH]
 
 * Ensure that the instance variables are copied to the template when performing render :update. [Nicholas Seckar]
diff --git a/actionpack/lib/action_controller/verification.rb b/actionpack/lib/action_controller/verification.rb
index 774af345327afda02e51a9f72a18f7bc2fdad2e4..0bef8d85a88237bc6d26281ab4bdd7afbc577d32 100644
--- a/actionpack/lib/action_controller/verification.rb
+++ b/actionpack/lib/action_controller/verification.rb
@@ -47,6 +47,8 @@ module ClassMethods
       #   must match the current request method in order for the action(s) to
       #   be safely called. (The key should be a symbol: <tt>:get</tt> or
       #   <tt>:post</tt>, for example.)
+      # * <tt>:xhr</tt>: true/false option to ensure that the request is coming
+      #   from an Ajax call or not. 
       # * <tt>:add_flash</tt>: a hash of name/value pairs that should be merged
       #   into the session's flash if the prerequisites cannot be satisfied.
       # * <tt>:redirect_to</tt>: the redirection parameters to be used when