diff --git a/activerecord/lib/active_record/store.rb b/activerecord/lib/active_record/store.rb
index 3c291f28e39721b91be178fd217767d7e1904476..aa9d199227a16dfda88ea78bc2d6c704f2b3f8d0 100644
--- a/activerecord/lib/active_record/store.rb
+++ b/activerecord/lib/active_record/store.rb
@@ -15,11 +15,14 @@ module ActiveRecord
   # You can set custom coder to encode/decode your serialized attributes to/from different formats.
   # JSON, YAML, Marshal are supported out of the box. Generally it can be any wrapper that provides +load+ and +dump+.
   #
-  # NOTE - If you are using PostgreSQL specific columns like +hstore+ or +json+ there is no need for
+  # NOTE: If you are using PostgreSQL specific columns like +hstore+ or +json+ there is no need for
   # the serialization provided by +store+. Simply use +store_accessor+ instead to generate
   # the accessor methods. Be aware that these columns use a string keyed hash and do not allow access
   # using a symbol.
   #
+  # NOTE: The default Validations with the exception of +uniqueness+ will work. For example, if you
+  # want to check for +uniqueness+ with +hstore+ you will need to use a custom validation to handle it.
+  #
   # Examples:
   #
   #   class User < ActiveRecord::Base