diff --git a/draft/overlay/piborg-tropi.md b/draft/overlay/piborg-tropi.md
index 70f6337..200a81d 100644
--- a/draft/overlay/piborg-tropi.md
+++ b/draft/overlay/piborg-tropi.md
@@ -20,12 +20,12 @@ ground:
 pin:
   '16':
     name: Clock
-	mode: output
-	active: low
+    mode: output
+    active: low
   '18':
-	name: Data
-	mode: output
-	active: low
+    name: Data
+    mode: output
+    active: low
 -->
 #TroPi