diff --git a/reference/configuration/framework.rst b/reference/configuration/framework.rst
index ce1062de1c8..c9ece98be72 100644
--- a/reference/configuration/framework.rst
+++ b/reference/configuration/framework.rst
@@ -3268,7 +3268,7 @@ settings from the base pool as defaults.
 
 .. note::
 
-    Your service MUST implement the ``Psr\Cache\CacheItemPoolInterface`` interface.
+    Your service **must** implement the ``Psr\Cache\CacheItemPoolInterface`` interface.
 
 public
 """"""