diff --git a/devel/yaml_api.md b/devel/yaml_api.md
index dc3b167..4bea213 100644
--- a/devel/yaml_api.md
+++ b/devel/yaml_api.md
@@ -492,7 +492,7 @@ interfaces:
 
 This is the example of interface with dynamic IP addresses:
 
-```
+```yml
 ---
 interfaces:
   - name: eth1