diff --git a/performance.rst b/performance.rst
index 82ca370e33d..f3f321ee457 100644
--- a/performance.rst
+++ b/performance.rst
@@ -79,14 +79,12 @@ real and absolute file system paths. This increases the performance for
 applications like Symfony that open many PHP files, especially on Windows
 systems.
 
-By default, PHP sets a ``realpath_cache_size`` of ``16K`` which is too low for
-Symfony. Consider updating this value at least to ``4096K``. In addition, cached
-paths are only stored for ``120`` seconds by default. Consider updating this
-value too using the ``realpath_cache_ttl`` option:
+Consider increasing the ``realpath_cache_size`` and ``realpath_cache_ttl``:
 
 .. code-block:: ini
 
     ; php.ini
+    ; 4096k is the default value in PHP 7.2
     realpath_cache_size=4096K
     realpath_cache_ttl=600