diff --git a/changelogs/server_server/newsfragments/2559.clarification b/changelogs/server_server/newsfragments/2559.clarification
new file mode 100644
index 000000000..cdb9cfe04
--- /dev/null
+++ b/changelogs/server_server/newsfragments/2559.clarification
@@ -0,0 +1 @@
+Clarify which events are targeted by backfill.