diff --git a/articles/151_roslaunch_xml.md b/articles/151_roslaunch_xml.md
index b1cdc8b0b..f9246b0cc 100644
--- a/articles/151_roslaunch_xml.md
+++ b/articles/151_roslaunch_xml.md
@@ -94,7 +94,7 @@ The `<let>` tags allows for definition of scoped launch file configuration varia
 
 ##### Examples
 
-```
+```xml
 <let name="foo" value="$(env BAR)"/>
 <let name="baz" value="false"/>
 ```