diff --git a/admin_manual/configuration_server/config_sample_php_parameters.rst b/admin_manual/configuration_server/config_sample_php_parameters.rst
index 78be88536..ff4b0880a 100644
--- a/admin_manual/configuration_server/config_sample_php_parameters.rst
+++ b/admin_manual/configuration_server/config_sample_php_parameters.rst
@@ -2083,7 +2083,10 @@ the system temporary directory is on a limited space ramdisk or is otherwise
 restricted, or if external storage which do not support streaming are in
 use.
 
-The Web server user must have write access to this directory.
+The Web server user/PHP must have write access to this directory.
+Additionally you have to make sure that your PHP configuration considers this a valid
+tmp directory, by setting the TMP, TMPDIR, and TEMP variables to the required directories.
+On top of that you might be required to grant additional permissions in AppArmor or SELinux.
 
 ::