diff --git a/en/appendices/4-0-migration-guide.rst b/en/appendices/4-0-migration-guide.rst
index e6fcee6577..accbc393f2 100644
--- a/en/appendices/4-0-migration-guide.rst
+++ b/en/appendices/4-0-migration-guide.rst
@@ -144,9 +144,10 @@ Error
 Http
 ----
 
+* ``Cake\Http\Client`` now follows `PSR-18: HTTP Client <https://www.php-fig.org/psr/psr-18/>_` specifications.
 * ``Cake\Http\Client\Response::isSuccess()`` was added. This method returns true
   if the response status code is 2xx.
-  
+
 Mailer
 ------