diff --git a/portnums.proto b/portnums.proto
index 14c5eef..1ebd7f8 100644
--- a/portnums.proto
+++ b/portnums.proto
@@ -120,6 +120,14 @@ enum PortNum {
    */
   ZPS_APP = 68;
 
+  /*
+   * Used to let multiple instances of Linux native applications communicate 
+   * as if they did using their LoRa chip.
+   * Maintained by GitHub user GUVWAF. 
+   * Project files at https://github.com/GUVWAF/Meshtasticator 
+   */
+  SIMULATOR_APP = 69;
+
   /*
    * Private applications should use portnums >= 256.
    * To simplify initial development and testing you can use "PRIVATE_APP"