diff --git a/Deep-Verification-Base.md b/Deep-Verification-Base.md
index 811dd5c..9f6d5eb 100644
--- a/Deep-Verification-Base.md
+++ b/Deep-Verification-Base.md
@@ -38,7 +38,7 @@ The layout engine is based on the Region, Edges and EdgePairs classes. Currently
  * When writing the deep collection data back to the original layout, hierarchy mapping from the temporary store to the original layout's hierarchy has to happen. KLayout already provides several methods to implement this mapping. 
 
 Finally, the suggested use model could be like this
-```
+```ruby
 # A sample DRC script using deep mode
 
 l1 = input(1, 0)