diff --git a/swagger/sdrangel/api/swagger/include/UDPSource.yaml b/swagger/sdrangel/api/swagger/include/UDPSource.yaml
index 129d240ac..641de4ddc 100644
--- a/swagger/sdrangel/api/swagger/include/UDPSource.yaml
+++ b/swagger/sdrangel/api/swagger/include/UDPSource.yaml
@@ -47,6 +47,14 @@ UDPSourceSettings:
     udpPort:
       type: integer
       format: uint16
+    multicastAddress:
+      type: string
+    multicastJoin:
+      type: integer
+      description: >
+        Joim multicast group
+        * 0 - leave group
+        * 1 - join group
     title:
       type: string
     streamIndex: