diff --git a/context/glass-cockpit.md b/context/glass-cockpit.md
index d442a30..d57bf22 100644
--- a/context/glass-cockpit.md
+++ b/context/glass-cockpit.md
@@ -45,8 +45,9 @@ version skew (a stale steam exe shipped 2 days behind), tripled build time, and
   glass + scripted click → ConfigureMappables end-to-end; exe runs WITHOUT steam_api.dll
   present; glass zero-arg → menu; 2-node loopback MP (145 ticks each); `BT_STEAM_NET=1`
   without Steam → "staying on Winsock" + game runs.
-- **Convention:** every `BT_*` name is a RUNTIME env gate (`BTEnvOn`); there are NO compile
-  feature gates anymore — do not add one without updating this file.
+- **Convention:** every `BT_*` name is a RUNTIME env gate (`BTEnvOn`) — with the single
+  exception of `BT_STEAM`, the license compile gate above. Do not add another compile gate
+  without updating this file.
 - No weak-linkage/optional symbols — `/FORCE` turns unresolved externals into runtime AVs
   ([[reconstruction-gotchas]]); everything links always, so this class of trap no longer varies
   by build flavor.