diff --git a/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportStopTransformAction.java b/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportStopTransformAction.java
index 010cfd1cbb6f2..aaf51396abb87 100644
--- a/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportStopTransformAction.java
+++ b/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportStopTransformAction.java
@@ -398,7 +398,9 @@ private void waitForTransformStopped(
                     if (stillRunningTasks.size() > 0) {
                         message.append("Could not stop the transforms ");
                         message.append(stillRunningTasks);
-                        message.append(" as they timed out.");
+                        message.append(" as they timed out [");
+                        message.append(timeout.toString());
+                        message.append("].");
                     }
 
                     listener.onFailure(new ElasticsearchStatusException(message.toString(), RestStatus.REQUEST_TIMEOUT));