diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5067a2bc5..812206dd6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+- Monologue display system visual spec — typography, positioning, stacking, priority, fade animation, character color differentiation, 80-char line constraint (#315)
+
 ## [v0.1.12] — 2026-02-19
 
 ### Added