Update README.md

README.md

@@ -62,7 +62,7 @@ end
 
 And again, that `ImmutableDog` consists of one line of plain Ruby and two lines of standard Rails validations.
 
-### `attr_reader` followed by `validates` is such a common pattern that there's a second DSL which wraps them up into one call: `validates_attr`.
+### `attr_reader` followed by `validates` is such a common pattern that there's a DSL which wraps them up into one call: `validates_attr`.
 
 Here's the immutable version of `Dog` re-written with the new, simplified DSL: