diff --git a/config/config.sample.php b/config/config.sample.php
index d7f9b217061..36429492bf6 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -1439,6 +1439,7 @@ $CONFIG = array(
 
 /**
  * Define a default folder for shared files and folders other than root.
+ * Changes to this value will only have effect on new shares.
  *
  * Defaults to ``/``
  */