diff --git a/mission/tmtc/comDefinitions.h b/mission/tmtc/comDefinitions.h
index 92fe6977..97f99ea6 100644
--- a/mission/tmtc/comDefinitions.h
+++ b/mission/tmtc/comDefinitions.h
@@ -1,3 +1,12 @@
 #pragma once
 
-namespace com {}
+#include <cstdint>
+
+namespace com {
+
+enum Submodes: uint8_t {
+  NONE = 0,
+  TX_ON = 1
+};
+
+}