diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5747cf8d2..2066ee782 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ### Added
 - `project.yaml` — technical project descriptor with version, architecture, simulation, and content model as the canonical version source of truth
+- `make perf-baseline` — full plugin stack tick benchmark (50 measured ticks, 5 warmup) capturing per-tick timing, entity counts, process RSS, and shadowcast benchmarks; outputs structured JSON to `tests/perf/baseline.json` with `--compare` mode for regression detection (>20% threshold, D-026 budget check)
+
+### Fixed
+- Bidirectional relationship check (#515) — Check 9 tested `target in npc_rels` which missed NPCs with no relationship entries; changed to `target in self.npcs`
 
 ## [v0.1.9] — 2026-02-18