diff --git a/docs/docs/10-intro.md b/docs/docs/10-intro.md
index 7b1d8dab3..8d5b03f0d 100644
--- a/docs/docs/10-intro.md
+++ b/docs/docs/10-intro.md
@@ -63,7 +63,7 @@ steps:
 - And make the yaml declarative
 - Plugins are Docker images with your script as an entrypoint
 
-```yaml title="Dockerfile"
+```dockerfile title="Dockerfile"
 FROM laszlocloud/kubectl
 COPY deploy /usr/local/deploy
 ENTRYPOINT ["/usr/local/deploy"]