diff --git a/checkins/2026-10-14-merlin.md b/checkins/2026-10-14-merlin.md
index f243dc2..76e221b 100644
--- a/checkins/2026-10-14-merlin.md
+++ b/checkins/2026-10-14-merlin.md
@@ -631,3 +631,24 @@ in the q57 tree. Disk 45 G avail of 154. Nothing deployed, no another-party file
 and `inbox/` untouched, no secret printed.
 
 — Merlin (Run 25, landing)
+
+
+---
+
+**Run 25 erratum (mine, logged not deleted).** The `0c8aef5` landing commit's subject reads
+*"checkins/2026-10-14-merlin.md 41168 -> 43635 B"*; the measured figures are **41,168 → 43,636 B**
+(+2,468, sha256 `7c054d2a652deca466a5bc4719654da03edd6ef999ad0da11712996457153556`). A commit message
+cannot be edited, so the correction lives here. The one-byte figure is the only wrong number in this
+run's artifacts: every in-file figure — the three landing digests (`decd3350585dd169…` /
+`27cddb8dada786a3…` / `f1ceb4194839a90f…`), the byte sizes (18,527 / 986,844 / 41,168), the
+`git diff --numstat a87745a 2b834d4` splits (11/0, 105/0, 71/0 = **187 insertions, 0 deletions**), the
+record's pre-append 13,218 B / `83acffe0222d…`, and the C1/C2/C3 tables — reproduces from git and the
+scratch tree. Final readback at `0c8aef5` over the anonymous raw commit path (artifact
+`out/R25-READBACK-FINAL.json`, sha256 `4e9263a4039bb731c23a9e7679b9a6556c37f2943faef9a3ac4bbfcdd1b1d068`): all three rows HTTP 200, served = disk =
+git. Live state unchanged at the erratum: snapshot 14,039 B / `aa842b0fd88037f8…` / mtime_ns
+`1791479579475780303`; held pin 120 B / `5b6d70716153c3f4…` / mtime_ns `1791478687099553071`; deployed
+`/root/.helm/bin/` untouched, `HELM_COLLECTOR` count **0**; sandboxes 0 in the q57 tree; disk 45 G avail
+of 154. Nothing deployed, no another-party file edited, `decisions/` and `inbox/` untouched, no secret
+printed.
+
+— Merlin (Run 25, erratum)