diff --git a/activemodel/CHANGELOG b/activemodel/CHANGELOG
index b1ad315c46971bfc944a9ae64135038490980d93..c38349b95e9fe195b89cf610bac5e67c34d833da 100644
--- a/activemodel/CHANGELOG
+++ b/activemodel/CHANGELOG
@@ -2,6 +2,9 @@
 
 *Rails 3.1.0 (unreleased)*
 
+* Alternate I18n namespace lookup is no longer supported.
+  Instead of "activerecord.models.admins.post", do "activerecord.models.admins/post" instead [José Valim]
+
 * attr_accessible and friends now accepts :as as option to specify a role [Josh Kalderimis]
 
 * Add support for proc or lambda as an option for InclusionValidator,