diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index d3d3188d95..f8fd2403ef 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Fallback `ActionController::Parameters#to_s` to `Hash#to_s`.
+
+    *Kir Shatrov*
+
 *   `driven_by` now registers poltergeist and capybara-webkit
 
     If driver poltergeist or capybara-webkit is set for System Tests,