diff --git a/test/c/textbook.en.md b/test/c/textbook.en.md
index 1686c6dc1..3d0c4361d 100644
--- a/test/c/textbook.en.md
+++ b/test/c/textbook.en.md
@@ -8,4 +8,4 @@ lessons:
       order: 1
 ---
 
-## TEST C
+## TEST C  en