diff --git a/rollover/review.sh b/rollover/review.sh
new file mode 100755
index 0000000..e459832
--- /dev/null
+++ b/rollover/review.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+# Regenerate the whole-corpus prune diff. The plan requires reviewing this
+# before the timer runs, and again after any change to the rule.
+set -eu
+
+NOTES="${1:-$HOME/docs/notes/todo}"
+HERE=$(cd "$(dirname "$0")" && pwd)
+OUT="${OUT:-$HOME/todo-prune-review.diff}"
+
+: > "$OUT"
+for f in "$NOTES"/*.md; do
+    p=$(python3 "$HERE/prune.py" "$f")
+    if [ "$p" != "$(cat "$f")" ]; then
+        printf '%s\n' "$p" | diff -u --label "$f (now)" --label "$f (pruned)" "$f" - >> "$OUT" || true
+    fi
+done
+echo "$OUT: $(grep -c '^-[^-]' "$OUT" || true) lines removed across $(grep -c '^---' "$OUT" || true) files"