diff --git a/PyPass.py b/PyPass.py
index e5d5dd3..b78a15d 100755
--- a/PyPass.py
+++ b/PyPass.py
@@ -31,7 +31,8 @@ measurement = [
         "fields": {
             "initialVolume": respJson['initialVolume'],
             "usedVolume": respJson['usedVolume'],
-            "remainingSeconds": respJson['remainingSeconds']
+            "remainingSeconds": respJson['remainingSeconds'],
+            "usedAtMillis": respJson['usedAt']
         }
     }
 ]