diff --git a/changelog.d/17793.misc b/changelog.d/17793.misc
new file mode 100644
index 00000000000..ea9a99583c6
--- /dev/null
+++ b/changelog.d/17793.misc
@@ -0,0 +1 @@
+Add missing license header.
diff --git a/synapse/storage/schema/main/delta/88/01_add_delayed_events.sql b/synapse/storage/schema/main/delta/88/01_add_delayed_events.sql
index 55bfbc8ae7c..78ba5129af5 100644
--- a/synapse/storage/schema/main/delta/88/01_add_delayed_events.sql
+++ b/synapse/storage/schema/main/delta/88/01_add_delayed_events.sql
@@ -1,3 +1,16 @@
+--
+-- This file is licensed under the Affero General Public License (AGPL) version 3.
+--
+-- Copyright (C) 2024 New Vector, Ltd
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU Affero General Public License as
+-- published by the Free Software Foundation, either version 3 of the
+-- License, or (at your option) any later version.
+--
+-- See the GNU Affero General Public License for more details:
+-- <https://www.gnu.org/licenses/agpl-3.0.html>.
+
 CREATE TABLE delayed_events (
     delay_id TEXT NOT NULL,
     user_localpart TEXT NOT NULL,