diff --git a/zaf_protocol.h b/zaf_protocol.h
index f580c00..d362cf8 100644
--- a/zaf_protocol.h
+++ b/zaf_protocol.h
@@ -38,6 +38,7 @@ typedef enum {
   kzaf_cmd_factory_reset     = 5,
   kzaf_cmd_reboot            = 6,
   kzaf_cmd_storage_cfg       = 7,
+  kzaf_cmd_ping              = 8,
 } zaf_protocol_cmd_t;
 
 typedef enum {