diff --git a/changelog.d/18401.bugfix b/changelog.d/18401.bugfix
new file mode 100644
index 0000000000..8ad0c779b3
--- /dev/null
+++ b/changelog.d/18401.bugfix
@@ -0,0 +1 @@
+Allow adjusting the batch size for the `populate_participant_bg_update` background update.
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