There's no -q switch to kill

diff --git a/README.docker.md b/README.docker.md
index 6232a32a6639045ce0a675810d52d0e8cc20cafe..348ba5bdc4e9f4d36bafdf9c6626c852b3f45b66 100644 (file)
--- a/README.docker.md
+++ b/README.docker.md
@@ -8,5 +8,5 @@ than access to running docker engine and docker client program.
 To kill all containers created by cleanbuild:
 
 ```shell
-docker ps -f label=cleanbuild --format '{{.ID}}' | xargs -r docker kill -q
+docker ps -f label=cleanbuild --format '{{.ID}}' | xargs -r docker kill
 ```