diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index 6a0e79a7b3c4b4887dab059a74ffe0c13209785f..e9ef6aac6d6294028ebb9bd46b42ad27d5a84baa 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Make :null_store the default store in the test environment.
+
+    *Michael C. Nelson*
+
 *   Emit warning for unknown inflection rule when generating model.
 
     *Yoshiyuki Kinjo*