diff --git a/src/GmRelay.Shared/Domain/CalendarSubscriptionFilter.cs b/src/GmRelay.Shared/Domain/CalendarSubscriptionFilter.cs
new file mode 100644
index 0000000..7b1b686
--- /dev/null
+++ b/src/GmRelay.Shared/Domain/CalendarSubscriptionFilter.cs
@@ -0,0 +1,7 @@
+namespace GmRelay.Shared.Domain;
+
+public enum CalendarSubscriptionFilter
+{
+    AllMyGroups = 0,
+    SpecificGroup = 1
+}