diff --git a/README.mdown b/README.mdown
index ab79a20..08ae302 100644
--- a/README.mdown
+++ b/README.mdown
@@ -75,7 +75,7 @@ This will drop you into the visual studio developer shell or console for winxp.
 
 To modify the developer shell environments replace `command:` in your `docker-compose.yaml` with the desired environment variables or scripted build commands.
 
-```
+```yaml
 version: '3'
 
 services: