diff --git a/meshtastic/portnums.proto b/meshtastic/portnums.proto
index 1f8cdb9f..a4b55e57 100644
--- a/meshtastic/portnums.proto
+++ b/meshtastic/portnums.proto
@@ -105,6 +105,11 @@ enum PortNum {
    */
   DETECTION_SENSOR_APP = 10;
 
+  /*
+   * Same as Text Message but used for critical alerts.
+   */
+  ALERT_APP = 11;
+
   /*
    * Provides a 'ping' service that replies to any packet it receives.
    * Also serves as a small example module.