diff --git a/meshtastic/portnums.proto b/meshtastic/portnums.proto
index b6c977603..251248d13 100644
--- a/meshtastic/portnums.proto
+++ b/meshtastic/portnums.proto
@@ -253,6 +253,13 @@ enum PortNum {
    */
   ATAK_PLUGIN_V2 = 78;
 
+  /*
+   * App for hydris protobuf, open source tactical sensor awareness,
+   * "home assistant for the outdoors"
+   * ENCODING: hydris protobuf
+   */
+  HYDRIS_APP = 79;
+
   /*
    * GroupAlarm integration
    * Used for transporting GroupAlarm-related messages between Meshtastic nodes