diff --git a/doc/sample/Simple.im b/doc/sample/Simple.im
index 0acd9c7..0ecefab 100644
--- a/doc/sample/Simple.im
+++ b/doc/sample/Simple.im
@@ -4,7 +4,7 @@ use std.io
 
 class Simple
     - init(name:name age:age)
-		v = 1 + 2 squared + not 3.
+        v = 1 + 2 squared + not 3.
         self::name = name.
         self::age = age!