diff --git a/li.strolch.agent/src/main/java/li/strolch/runtime/StrolchConstants.java b/li.strolch.agent/src/main/java/li/strolch/runtime/StrolchConstants.java
index 1a0af935b..2e9db3234 100644
--- a/li.strolch.agent/src/main/java/li/strolch/runtime/StrolchConstants.java
+++ b/li.strolch.agent/src/main/java/li/strolch/runtime/StrolchConstants.java
@@ -140,5 +140,6 @@ public class StrolchConstants extends StrolchModelConstants {
 		public static final String PARAM_QUANTITY = "quantity";
 		public static final String PARAM_DURATION = "duration";
 		public static final String PARAM_ORDER = "order";
+		public static final String PARAM_ACTIVITY = "activity";
 	}
 }