diff --git a/activerecord/lib/active_record/attributes.rb b/activerecord/lib/active_record/attributes.rb
index b263a89d790a6052fe0078db7bca1c634d77908b..faf5d632ec8d804622810742d252d3097ccc7e07 100644
--- a/activerecord/lib/active_record/attributes.rb
+++ b/activerecord/lib/active_record/attributes.rb
@@ -14,7 +14,7 @@ module Attributes # :nodoc:
     end
 
     module ClassMethods # :nodoc:
-      # Defines or overrides a attribute on this model. This allows customization of
+      # Defines or overrides an attribute on this model. This allows customization of
       # Active Record's type casting behavior, as well as adding support for user defined
       # types.
       #