diff --git a/src/pretix/presale/signals.py b/src/pretix/presale/signals.py
index 077b35d2c2..38ae0dca0f 100644
--- a/src/pretix/presale/signals.py
+++ b/src/pretix/presale/signals.py
@@ -126,7 +126,7 @@ footer_link = EventPluginSignal()
 Arguments: ``request``
 
 The signal ``pretix.presale.signals.footer_link`` allows you to add links to the footer of an event page. You
-are expected to return a dictionary containing the keys ``label`` and ``url``.
+are expected to return a dictionary containing the keys ``label``, ``url`` and optionally ``cssclass``.
 
 As with all event plugin signals, the ``sender`` keyword argument will contain the event.
 """