diff --git a/CHANGELOG-4.0.md b/CHANGELOG-4.0.md
index e8a2529c839..a71514d9748 100644
--- a/CHANGELOG-4.0.md
+++ b/CHANGELOG-4.0.md
@@ -1,2 +1,3 @@
 # [4.0.0](https://github.com/phalcon/cphalcon/releases/tag/v4.0.0) (2017-XX-XX)
 - MVC Application and Router now must have a URI to process [#12380](https://github.com/phalcon/cphalcon/pull/12380)
+- Response headers and cookies are no longer prematurely sent [#12378](https://github.com/phalcon/cphalcon/pull/12378)