diff --git a/doc/ci/docker/using_docker_build.md b/doc/ci/docker/using_docker_build.md
index 7f83f84645496e3037705d63680c7cac096ed5c4..0f64137a8a9bc1c44abcb4aec24bed9abdaf7e3e 100644
--- a/doc/ci/docker/using_docker_build.md
+++ b/doc/ci/docker/using_docker_build.md
@@ -38,7 +38,7 @@ GitLab Runner then executes build scripts as the `gitlab-runner` user.
     $ sudo gitlab-ci-multi-runner register -n \
       --url https://gitlab.com/ci \
       --registration-token REGISTRATION_TOKEN \
-      --executor shell
+      --executor shell \
       --description "My Runner"
     ```