diff --git a/docs/HANDOFF.md b/docs/HANDOFF.md
index 4400273..4ec3795 100644
--- a/docs/HANDOFF.md
+++ b/docs/HANDOFF.md
@@ -80,9 +80,10 @@ generator still grows pixels, because `deferred_generated.rs` already varies
 that dimension and growing fractions here would move every box in the cold
 dump; the comment says that instead of describing an open defect.
 
-`docs/LAYOUT_LOG.md` has all seven, with the five things the sweep looked at
-and left. Verified: format, clippy both ways, 208 and 212 tests, and the
-cold dump byte-identical to `f48e04e` across all 34,986 boxes.
+`docs/LAYOUT_LOG.md` has all seven, with the four things the sweep looked
+at and left and the one it withdrew. Verified: format, clippy both ways,
+208 and 212 tests, and the cold dump byte-identical to `f48e04e` across all
+34,986 boxes.
 
 ## A quality sweep of the request arena is submitted on PR #19
 
diff --git a/docs/LAYOUT_LOG.md b/docs/LAYOUT_LOG.md
index aebfb73..495b460 100644
--- a/docs/LAYOUT_LOG.md
+++ b/docs/LAYOUT_LOG.md
@@ -63,7 +63,7 @@ all sixteen cases agree warm against cold with every bound a fraction
 corpus and growing fractions here would move every box in the cold dump for
 overlap; the comment now says that rather than describing an open defect.
 
-Five things the sweep **looked at and left**:
+Four things the sweep **looked at and left**, and one it withdrew:
 
 - **`independent_order` compares two lengths by `leftover` where their pixels
   and fractions are equal**, which is only sound while a leftover resolves at
@@ -82,9 +82,14 @@ Five things the sweep **looked at and left**:
   preferred length, the mirror of the defect fixed above. Left because
   nothing asks for it yet and the preferred length has no remover either; the
   asymmetry is uniform.
-- **`Moves::clear` replaces its arena rather than clearing it**, throwing away
-  capacity where `RequestArena::reset` deliberately keeps it. Left: it runs
-  only on a full redraw, and `Arena` has no `clear`.
+- **`Moves::clear` replaces its arena rather than clearing it.** Raised as
+  the shape `RequestArena::reset` deliberately avoids, and withdrawn: that
+  one keeps its capacity because it runs every frame and the allocation rig
+  checks the steady state allocates nothing, where `Moves::clear` runs only
+  when the root changes, next to a rebuild of the whole tree that re-grows it
+  anyway. `Arena` also holds an `IdTracker` that a clear has to reset, which
+  `Arena::default()` says in one line. Frequency is what separates the two,
+  and the code looks the same either way.
 - **`TextEditCtx::apply_event` reads `if undo && let Some(..)` with an `else
   if` after it**, so an undo with an empty history now falls into the branch
   that pushes history. It is equivalent only because an undo command does not