diff --git a/admin_manual/configuration_server/config_sample_php_parameters.rst b/admin_manual/configuration_server/config_sample_php_parameters.rst
index 45d3ea60a..b35f345d0 100644
--- a/admin_manual/configuration_server/config_sample_php_parameters.rst
+++ b/admin_manual/configuration_server/config_sample_php_parameters.rst
@@ -2821,7 +2821,8 @@ Override where Nextcloud stores update files while updating. Useful in situation
 where the default `datadirectory` is on network disk like NFS, or is otherwise
 restricted. Defaults to the value of `datadirectory` if unset.
 
-The Web server user must have write access to this directory.
+If set, the value MUST be located _outside_ of the installation directory of Nextcloud and
+writable by the Web server user.
 
 blacklisted_files
 ^^^^^^^^^^^^^^^^^