diff --git a/case/top.scad b/case/top.scad
index 337c4ca..fc9ed8b 100644
--- a/case/top.scad
+++ b/case/top.scad
@@ -15,6 +15,7 @@ include <keyboard.scad>
  * First horizontal ridge: Starts at keyboard X offset
  * Ridge height: 11.5mm
  * Ridge upper aspect: 8mm
+ * Ridge lower aspect: 5mm
  * First vertical ridge Y offset: 8mm
  */