diff --git a/slides/k8s/buildshiprun-dockerhub.md b/slides/k8s/buildshiprun-dockerhub.md
index ea949cfc..1a75774f 100644
--- a/slides/k8s/buildshiprun-dockerhub.md
+++ b/slides/k8s/buildshiprun-dockerhub.md
@@ -33,7 +33,7 @@
   **make sure that you set `$REGISTRY` and `$TAG` first!**
 
 - For example:
-  ```
+  ```bash
   export REGISTRY=dockercoins TAG=v0.1
   ```