diff --git a/CHANGELOG.md b/CHANGELOG.md
index a194023..ba2799d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,14 @@ Released with 2meet-data-optimizer 1.3.0 (hardening 2.3).
   HivePress writes the value before its timeout, and a miss only makes it
   rebuild). Entries of deleted posts no longer pile up. (PR-099)
 
+### Added
+
+- Opt-in flattening of a site's own listing attributes: the
+  `tmdo_hp_listing_attribute_fields` filter (`'hp_warranty' => 'integer'`)
+  registers them in an `hp_listing_attrs` group — a new table, each column
+  indexed at creation — leaving `hp_listing_core` unchanged. Backfill with
+  `wp tmdo post-migrate-group`. (PR-109)
+
 ### Upgrading
 
 - Deploy with core 1.3.0: on an older core the AddOn declares no index at all