diff --git a/CLAUDE.md b/CLAUDE.md
index 0371b47..71616d9 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -4,6 +4,10 @@ Ground-up Python replacement for **Blastware**, Instantel's Windows-only softwar
 managing MiniMate Plus seismographs. Connects over direct RS-232 or cellular modem
 (Sierra Wireless RV50 / RV55). Current version: **v0.27.0**.
 
+Stack-level context — which repo owns what, and how the three project versions
+pair — lives in `../terra-view/docs/tmi-stack.md`, which is also loaded as
+`~/CLAUDE.md`.
+
 ---
 
 ## Where things stand (updated 2026-08-28)