diff --git a/Node-msg-Conventions.md b/Node-msg-Conventions.md
index d39b5a6..96d0ee3 100644
--- a/Node-msg-Conventions.md
+++ b/Node-msg-Conventions.md
@@ -20,9 +20,8 @@ There are a few reserved properties within the structure of the msg objects bein
 
 ### For Fitness/activity based nodes/flows: ###
 
-
+* **msg.payload.id** - The ID of the activity in the given fitness system/API
 * **msg.payload.duration** - Duration of the activity in **seconds**
 * **msg.payload.distance** - Distance of activity in **metres**
 * **msg.payload.calories** - Calories burned during activity in **kilocalories**
 * **msg.payload.starttime** - JavaScript Date object representing the start time of the activity
-