diff --git a/index.php b/index.php
index 7532d56..9deffcb 100644
--- a/index.php
+++ b/index.php
@@ -17,7 +17,7 @@ $allow_direct_link = true; // Set to false to only allow downloads and not direc
 
 $disallowed_extensions = ['php'];  // must be an array. Extensions disallowed to be uploaded
 
-$hidden_extensions = ['php']; // must be an array. Extensions hidden in directory index
+$hidden_extensions = ['php']; // must be an array of lowercase file extensions. Extensions hidden in directory index
 
 $PASSWORD = '';  // Set the password, to access the file manager... (optional)