diff --git a/09.md b/09.md
index d35a883d..ae051dda 100644
--- a/09.md
+++ b/09.md
@@ -27,7 +27,7 @@ The `.content` MAY contain the reason for the deletion. One or more `k` tags MAY
 
 Supporters MUST verify if the `pubkey` of the Deletion event is the same as the `pubkey` of the referenced events.
 
-Deletion events referencing an `a` tag delete all the referenced events up Deletion event's `created_at`. 
+Deletion events referencing an `a` tag delete all the referenced events up to the deletion event's `created_at`. 
 
 Relays SHOULD delete or stop publishing any referenced events of the deletion request.