diff --git a/CHANGELOG-4.0.md b/CHANGELOG-4.0.md
index 82d15d44255..201d58ee4ce 100644
--- a/CHANGELOG-4.0.md
+++ b/CHANGELOG-4.0.md
@@ -9,6 +9,7 @@
 - Fixed storing related model data in `Phalcon\Messages\Message`. The method is now `setMetadata` and can be used to store any metadata from any component that emits messages [#13811](https://github.com/phalcon/cphalcon/issues/13811)
 - Fixed Dispatcher calling camelize twice and producing incorrect results [#12829](https://github.com/phalcon/cphalcon/issues/12829)
 - Fixed `Phalcon\Mvc\Model:findFirst` to throw an exception when the passed parameter for a primary key is not an array, string or numeric [#13336](https://github.com/phalcon/cphalcon/issues/13336)
+- Added `Phalcon\Http\ResponseInterface::isSent`, that was already used. [#13836](https://github.com/phalcon/cphalcon/pull/13836)
 
 ## Changed
 - Renamed `Phalcon\Acl\Subject` to `Phalcon\Acl\Component` [#13808](https://github.com/phalcon/cphalcon/issues/13808)
diff --git a/phalcon/http/responseinterface.zep b/phalcon/http/responseinterface.zep
index 959e822bf4c..acc49165cc7 100644
--- a/phalcon/http/responseinterface.zep
+++ b/phalcon/http/responseinterface.zep
@@ -44,6 +44,11 @@ interface ResponseInterface
 	 */
 	public function hasHeader(string name) -> bool;
 
+	/**
+	 * Checks if the response was already sent
+	 */
+	public function isSent() -> bool;
+
 	/**
 	 * Redirect by HTTP to another action or URL
 	 */