diff --git a/config/config.sample.php b/config/config.sample.php
index 022b807a88..d329582e14 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -157,7 +157,11 @@ $CONFIG = array(
  * language codes such as ``en`` for English, ``de`` for German, and ``fr`` for
  * French. It overrides automatic language detection on public pages like login
  * or shared items. User's language preferences configured under "personal ->
- * language" override this setting after they have logged in.
+ * language" override this setting after they have logged in. Nextcloud has two
+ * distinguished language codes for German, 'de' and 'de_DE'. 'de' is used for
+ * informal German and 'de_DE' for formal German. By setting this value to 'de_DE'
+ * you can enforce the formal version of German unless the user has chosen
+ * something different explicitly.
  *
  * Defaults to ``en``
  */