diff --git a/meshtastic/portnums.proto b/meshtastic/portnums.proto
index 07c8051..f4d22e2 100644
--- a/meshtastic/portnums.proto
+++ b/meshtastic/portnums.proto
@@ -246,6 +246,13 @@ enum PortNum {
    */
   CAYENNE_APP = 77;
 
+  /*
+   * GroupAlarm integration
+   * Used for transporting GroupAlarm-related messages between Meshtastic nodes
+   * and companion applications/services.
+   */
+  GROUPALARM_APP = 112;
+
   /*
    * Private applications should use portnums >= 256.
    * To simplify initial development and testing you can use "PRIVATE_APP"