comma

railties/guides/source/active_support_core_extensions.textile

@@ -571,7 +571,7 @@ NOTE: Defined in +active_support/core_ext/module/attr_accessor_with_default.rb+.
 
 h5. Internal Attributes
 
-When you are defining an attribute in a class that is meant to be subclassed name collisions are a risk. That's remarkably important for libraries.
+When you are defining an attribute in a class that is meant to be subclassed, name collisions are a risk. That's remarkably important for libraries.
 
 Active Support defines the macros +attr_internal_reader+, +attr_internal_writer+, and +attr_internal_accessor+. They behave like their Ruby built-in +attr_*+ counterparts, except they name the underlying instance variable in a way that makes collisions less likely.