diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0e17af82f..1025c0ee0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 - Entity renderer skips redundant modulate.a writes when alpha unchanged (PR #11 review)
 
 ### Added
+- Observer snapshot knowledge integration (#366) — VisibleEntity carries relationship state (D-033 color) and observation type (Visible/Remembered), remembered entities appear as fog ghosts at last known position
 - Knowledge graph system (#361, #362, #363, #365) — per-entity KnowledgeGraph component (D-041), StableEntityId + EntityRegistry, KnowledgeEventQueue, decay system, 4-level confidence hierarchy
 - Direct observation knowledge flow (#364) — perception emits DirectObservation/LeftLOS events to knowledge graph, entities entering/leaving LOS tracked
 - Protocol v2 decoder — extracts game_time, player_facing, visible_tiles, and per-entity visibility sectors from ObserverSnapshot v2