diff --git a/portnums.proto b/portnums.proto
index a1198f4..53c841a 100644
--- a/portnums.proto
+++ b/portnums.proto
@@ -81,6 +81,11 @@ enum PortNum {
    */
   TEXT_MESSAGE_COMPRESSED_APP = 7;
 
+  /*
+   * Waypoint payloads.
+   */
+  WAYPOINT_APP = 8;
+
   /*
    * Provides a 'ping' service that replies to any packet it receives.
    * Also serves as a small example module.