diff --git a/cycle/src/test/java/com/camunda/fox/cycle/web/service/resource/RoundtripServiceTest.java b/cycle/src/test/java/com/camunda/fox/cycle/web/service/resource/RoundtripServiceTest.java
index <HASH>..<HASH> 100644
--- a/cycle/src/test/java/com/camunda/fox/cycle/web/service/resource/RoundtripServiceTest.java
+++ b/cycle/src/test/java/com/camunda/fox/cycle/web/service/resource/RoundtripServiceTest.java
@@ -166,6 +166,8 @@ public class RoundtripServiceTest {
     RoundtripDTO testRoundtrip = createAndFlushRoundtrip();
     BpmnDiagramDTO rightHandSide = testRoundtrip.getRightHandSide();
     
+    // needs to be here because invoke of diagramService.getImage(...), expects
+    // the image date to be 'now' + 5 secs. 'now' is set in roundtripService.doSynchronize(...)
     Thread.sleep(6000);
     
     roundtripService.doSynchronize(SyncMode.LEFT_TO_RIGHT, testRoundtrip.getId());
HEMERA-<I> Added comment why there is a Thread.sleep