diff --git a/de.prob.ui/src/de/prob/ui/operationview/CustomPreconditionDialogHandler.java b/de.prob.ui/src/de/prob/ui/operationview/CustomPreconditionDialogHandler.java
index 899c26b7e23b86465c44df14367b42719b3592ad..c609f3993694cc0267666f2a2fda8c5250be6048 100644
--- a/de.prob.ui/src/de/prob/ui/operationview/CustomPreconditionDialogHandler.java
+++ b/de.prob.ui/src/de/prob/ui/operationview/CustomPreconditionDialogHandler.java
@@ -30,7 +30,7 @@ public class CustomPreconditionDialogHandler extends AbstractHandler implements
 
 		if (filtered.size() != 1) {
 			Logger.notifyUser(filtered.size()
-					+ " operations selected. An additional Guard can only be added to a single operation");
+					+ " operations selected. An additional Guard Constraint can only be added to a single operation");
 			return null;
 		}