diff --git a/PLAN.md b/PLAN.md
index 8c73ab4..f0bcc77 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -367,6 +367,15 @@ the filesystem, since 52% of the steady-state file is space the database owns
 and is not using; it needs the file never to shrink below what the fallback
 generation references, which is its own crash-safety design pass.
 
+**One planned commit was declined on the measurement.** A same-length replace
+could be written in place when the document's bytes are on an unpublished page,
+and the plan made it conditional on the update line still being the worst. It
+is the worst — but the measurement says why, and it is not write amplification:
+the peak is set by the first rebuild's second copy, so generating less garbage
+moves the number by nothing. It would buy a write-path change, on the path that
+runs after the log record is durable, for no gate movement. Left undone with
+the reason, rather than done because it was listed.
+
 **Small documents behave exactly as forecast**, and the forecast being written
 down in advance is what makes it a result. 200-byte documents reclaim nothing
 at all — a 16 KiB system page holds ~70 of them and they never all die at once