diff --git a/how_to_design_programs/test.scm b/how_to_design_programs/test.scm
index 6f1f7b4..7be9c92 100644
--- a/how_to_design_programs/test.scm
+++ b/how_to_design_programs/test.scm
@@ -1 +1,2 @@
-#lang racket
+#lang scheme
+