diff --git a/Node-msg-Conventions.md b/Node-msg-Conventions.md
index 5c0b8f2..c0eb89f 100644
--- a/Node-msg-Conventions.md
+++ b/Node-msg-Conventions.md
@@ -18,5 +18,11 @@ There are a few reserved properties within the structure of the msg objects bein
 * **msg.time** - a time. The time should be either JavaScript Date object, or a number of milliseconds since epoch.
 
 
-### For Fitness/activity based nodes/flows ###
+### For Fitness/activity based nodes/flows: ###
+
+
+* ** 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