diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index e5d5bfe..1d0d914 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -6,6 +6,7 @@
    :maxdepth: 1
 
    unreleased
+   v21.0.0
    v20.0.0
    v19.0.0
    v18.0.0
diff --git a/releasenotes/source/v21.0.0.rst b/releasenotes/source/v21.0.0.rst
new file mode 100644
index 0000000..9ea8120
--- /dev/null
+++ b/releasenotes/source/v21.0.0.rst
@@ -0,0 +1,6 @@
+=====================
+v21.0.0 Release Notes
+=====================
+
+.. release-notes:: 21.0.0 Release Notes
+   :version: 21.0.0