diff --git a/CHANGELOG/2026.303.0348.md b/CHANGELOG/2026.303.0348.md
index bc45ad8..8ad7dd1 100644
--- a/CHANGELOG/2026.303.0348.md
+++ b/CHANGELOG/2026.303.0348.md
@@ -234,11 +234,21 @@ Harness `Claude Code`, model `minimax/minimax-m3.1-flash:cloud` — the pair the
 change is prose-only, so the tier is the prose tier: `documentation reviewed`. The runtime gates
 above were run and are pasted in full, but a runtime tier is not claimed for a comment-only change.
 
-**Two trailers, honestly.** The branch's own content commit `7e4d5fd` was authored in an earlier
+**The trailers, measured.** The branch's own content commit `7e4d5fd` was authored in an earlier
 session and keeps ITS trailer (`DeepSeek Harness deepseek-v4.1-flash`); the pushed head `1756c8c`
-is a merge commit written by this session and carries this session's trailer. GitHub's squash
+is a merge commit written by this session and carries this session's trailer. **MEASURED on the
+landing: GitHub's squash composes the landed message from the branch's NON-MERGE commit messages
+only, so the landed commit `ee7962bb` carries ONE trailer — the content author's — and the merge
+commit's message, with this session's trailer, is not carried into it.** The landed attribution is
+the content author's, which is correct for the change the commit carries.
+
+*Corrected after the merge.* The sentence that introduced this section said *"GitHub's squash
 composes the landed message from the branch's commit messages in order, so the landed commit
-carries both — each session's own authorship, neither overwritten.
+carries both — each session's own authorship, neither overwritten"*, which was false: GitHub composes
+the squash message from the branch's **non-merge** commit messages, so the landed commit `ee7962bb`
+carries ONE trailer — the content author's — and the merge commit `1756c8c`'s own message, with the
+takeover session's trailer, is not carried into it. The measurement was taken on the landing itself,
+and the wording was corrected here — in the record, not only in the pull request.
 
 Agent: charly