diff --git a/documentation/optimization.html b/documentation/optimization.html
index 95cac878c9..7f8f23cd7d 100755
--- a/documentation/optimization.html
+++ b/documentation/optimization.html
@@ -445,6 +445,24 @@ RewriteRule ([^/]+)/work/(.*)$ /main/work/download.php?file=work/$2&cDir=$1 [QSA
This is easy, doesn't require a server reload and you should see the results pretty quickly. As mentioned above, if security of your content is an issue, though, you should avoid using this technique.
+You can also mitigate the risk by disabling permissions check only
+for some static resource like css,js and fonts files.
+
+For that is required to load header module
+in apache (check with a2enmod in your favorite root terminal)
+add theses line after RewriteBase /courses/:
+
++ # all file name ended with these extensions names will bypass the permission check (and also served by the browser cache at the next request) + ++ Header unset Cache-Control + Header set Cache-Control "public, max-age=29030400" + RequestHeader unset Cookie + Header unset ETag + +