diff --git a/config/config.sample.php b/config/config.sample.php
index 4597ce9a77d..0267ae51c91 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -1840,7 +1840,10 @@ $CONFIG = [
  * 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.
  */
 'tempdirectory' => '/tmp/nextcloudtemp',