diff --git a/combo/settings.py b/combo/settings.py
index 1114ca8e..0d227f81 100644
--- a/combo/settings.py
+++ b/combo/settings.py
@@ -330,6 +330,9 @@ WCS_CATEGORY_ASSET_SLOTS = {
 
 WCS_FORM_ASSET_SLOTS = {}
 
+# known services
+KNOWN_SERVICES = {}
+
 # PWA Settings
 PWA_VAPID_PUBLIK_KEY = None
 PWA_VAPID_PRIVATE_KEY = None