diff --git a/docs/plans/release-0.3.17.md b/docs/plans/release-0.3.17.md
index 5bb7c75c9..127e90456 100644
--- a/docs/plans/release-0.3.17.md
+++ b/docs/plans/release-0.3.17.md
@@ -29,6 +29,10 @@ Final node tree 02d15a87 (75467244 + exec-sync-0313 40fd8d8c). Digests on the ex
 
 App tests on the merged tree: 175 + 28 + 8; UI 41. A whole-file take of a lane's branch on an older base dropped the release tree's own fixes (seen and reverted): the lanes rebase onto the release tree and resolve there; the shipper merges, never substitutes files.
 
+## 2a. Linux binaries by glibc (main's rule, 7 October 2026, 01:3x UK)
+
+HiveOS images are Ubuntu 20.04 (glibc 2.31); the canary pods on 22.04 (2.35) refused the box's binaries. From now: the HiveOS package carries the 2.31 zig build (the build-server lane produces and container-tests it; the 0.3.17 HiveOS row stays at 0.3.16 in the index until that package lands, then joins with its own read-back); seeds and generic Linux binaries are the 2.35 build; the fleet's own boxes (Ubuntu 24.04) take the box's native build. The Mac and Windows rows publish on their gates.
+
 ## 3. Owed
 
 - exec-sync-0313's consensus verification behind a feature off for Windows (the proving lane), then its two commits.