diff --git a/release.notes b/release.notes
index 35d4d391f..0edaf66fa 100644
--- a/release.notes
+++ b/release.notes
@@ -1,3 +1,6 @@
+[v5.0.0a21]
+
+
 [v5.0.0a20]
 
 FIX: (#677) set correct argument type for _expand