readme: better cmd-line for docker

diff --git a/README.md b/README.md
index 28be68400b46f436a3091b8aba6b1de7788ea6a9..948b5e007409f1b4ff59a61be44455bc98fbf0db 100644 (file)
--- a/README.md
+++ b/README.md
@@ -503,7 +503,7 @@ Deprecated options:
 
 To launch nsjail in a docker container clone the repository and build the docker image:
 <pre>
-docker build . -t nsjail
+docker build -t nsjail .
 </pre>
 
 This will build up an image containing njsail and kafel.