diff --git a/README.md b/README.md
index 987b7ee..c5e726a 100644
--- a/README.md
+++ b/README.md
@@ -28,5 +28,5 @@ node@itcross:~$ npm -v
 docker build -t my-word-cards .
 docker run -it -p 5000:5000 my-word-cards
 docker ps -a
-docker stop <container_id?
+docker stop <container_id>
 ```