diff --git a/src/pretix/base/settings.py b/src/pretix/base/settings.py
index 047f94e331..ba55e62deb 100644
--- a/src/pretix/base/settings.py
+++ b/src/pretix/base/settings.py
@@ -935,7 +935,8 @@ DEFAULTS = {
                 ('list', _('List')),
                 ('week', _('Week calendar')),
                 ('calendar', _('Month calendar')),
-            )
+            ),
+            help_text=_('If your event series has more than 100 dates, only the month or week calendar can be used.')
         ),
     },
     'last_order_modification_date': {