diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a584c7f9..a075297e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+- Triangle activation proximity monologue lines — 4 smuggler lines (Kael Davan) and 5 detective lines (Sera Venn/Torek Lintar) that fire when observing triangle anchor NPCs post-activation (#597, D-039)
+
 ## [v0.1.23] — 2026-03-04
 
 ### Added