diff --git a/CHANGELOG.md b/CHANGELOG.md
index 644e0a235..5542fd185 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 ## [Unreleased]
 
 ### Added
+- D-066: Dual-scale grid — 0.5m simulation tiles for stealth granularity, 1m visual tiles for proportional art (2x retina factor). All world geometry 2x2 sim tile minimum so cover/LOS maps 1:1 with visuals. Amends OQ-01.
 - Sprint CLI (`db/connectors/sprint`) — unified sprint lifecycle management with 5 subcommands: status, start, stop, start-work, prepare. Auto-detects sprint from DB state and team from git branch. Guards prevent activating unplanned sprints.
 - Shared permission settings in `.claude/settings.json` — git, ticket/sprint CLI, make, tea, and core skills pre-approved across all worktrees. Deny rules block destructive operations.
 - Decisions D-053 through D-065 from Control & Interaction Workshop — formalized interaction verb system, contextual actions, NPC awareness model, and related design decisions