diff --git a/docs/Documentation/test-doc.md b/docs/Documentation/test-doc.md
index 3614a5665..e2f478422 100644
--- a/docs/Documentation/test-doc.md
+++ b/docs/Documentation/test-doc.md
@@ -30,6 +30,10 @@ This is a heading 7
 
 This is a heading 20
 
+### Heading 21
+
+This is a heading 21
+
 Hello,
 
 ### Heading 9