diff --git a/changelog.d/3856.misc b/changelog.d/3856.misc
new file mode 100644
index 0000000000000000000000000000000000000000..36c311eb3db91d22c71468ab728d04036a6eead6
--- /dev/null
+++ b/changelog.d/3856.misc
@@ -0,0 +1 @@
+Speed up purge history for rooms that have been previously purged