diff --git a/proposals/xxxx-add-delete-backup.md b/proposals/2526-add-delete-backup.md
similarity index 93%
rename from proposals/xxxx-add-delete-backup.md
rename to proposals/2526-add-delete-backup.md
index b84de399..e4d589e3 100644
--- a/proposals/xxxx-add-delete-backup.md
+++ b/proposals/2526-add-delete-backup.md
@@ -1,4 +1,4 @@
-# Add ability to delete key backups
+# MSC2526: Add ability to delete key backups
 
 [MSC1219](https://github.com/matrix-org/matrix-doc/issues/1219) defined a
 mechanism for key backups.  However, it inadvertently omitted the endpoint to