diff --git a/mkdocs.yml b/mkdocs.yml
index 69966de1c51..c571e824269 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -287,7 +287,7 @@ nav:
       - Libraries: reference/libraries/README.md
       - Glossary: reference/glossary/README.md
   - Releases Notes:
-	  - 2.1.5: releases/2.1.5.md
+      - 2.1.5: releases/2.1.5.md
       - 2.1.4: releases/2.1.4.md
       - 2.1.3: releases/2.1.3.md
       - 2.1.2: releases/2.1.2.md