diff --git a/performance.rst b/performance.rst
index 67bd1989652..9c6ca08c0f2 100644
--- a/performance.rst
+++ b/performance.rst
@@ -22,7 +22,14 @@ the need to constantly recompile the PHP source code. There are a number of
 PHP comes with `OPcache`_ built-in. For older versions, the most widely used
 byte code cache is probably `APC`_
 
-Using a byte code cache really has no downside, and Symfony has been architected
+.. tip::
+
+    If your server still uses the legacy APC PHP extension, install the
+    `APCu Polyfill component`_ in your application to enable compatibility with
+    `APCu PHP functions`_ and unlock support for advanced Symfony features, such
+    as the APCu Cache adapter.
+
+Using a byte code cache really has no downside, and Symfony has been designed
 to perform really well in this type of environment.
 
 Further Optimizations