diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 96d9f5ea9..b555231a7 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -2,15 +2,15 @@
  taskflow Release Notes
 ===========================
 
- .. toctree::
-    :maxdepth: 1
+.. toctree::
+   :maxdepth: 1
 
-    unreleased
-    victoria
-    ussuri
-    train
-    stein
-    rocky
-    queens
-    pike
-    ocata
+   unreleased
+   victoria
+   ussuri
+   train
+   stein
+   rocky
+   queens
+   pike
+   ocata