diff --git a/.gitignore b/.gitignore
index 333447a..dfa1d45 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,7 +38,7 @@ Thumbs.db
 # Claude Code - local settings excluded, hooks tracked
 .claude/settings.local.json
 
-# Local reference clones (e.g. Stellarium Web Engine) — not part of the sim bundle
+# Upstream baselines live in ../Baseline; do not re-clone under reference/
 reference/
 
 # CI / local npm audit artifact (must not be linted)
diff --git a/CLAUDE.md b/CLAUDE.md
index e9d641a..72a9e21 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -4,7 +4,7 @@ Sim-specific context for AI assistants. General SceneryStack guidance: [OpenPhys
 
 ## Project
 
-SceneryStack **first-person planetarium** for the night sky. Observer location, civil time (with derived LST), look direction, and field of view live in `ZenithModel`; `PlanetariumSkyNode` projects the bright-star catalog and solar-system bodies. Architecture: [doc/model.md](doc/model.md), [doc/implementation-notes.md](doc/implementation-notes.md). Upstream reference (not shipped): `reference/stellarium-web-engine/` for projection and sky-rendering ideas.
+SceneryStack **first-person planetarium** for the night sky. Observer location, civil time (with derived LST), look direction, and field of view live in `ZenithModel`; `PlanetariumSkyNode` projects the bright-star catalog and solar-system bodies. Architecture: [doc/model.md](doc/model.md), [doc/implementation-notes.md](doc/implementation-notes.md). Upstream reference (not shipped): `../Baseline/Astronomy/stellarium-web-engine` for projection and sky-rendering ideas.
 
 ## Key files