diff --git a/REBUILD.md b/REBUILD.md
index 33926d4..92ae921 100644
--- a/REBUILD.md
+++ b/REBUILD.md
@@ -111,6 +111,8 @@ dropping garbage; 28 TB of compressed overview traffic. Throughput goal:
    instead of ~6–7; the speed is still set by the NNTP connections. The
    cost: a second implementation of lib/headers, lib/release, lib/rules and
    the chunk format, kept identical (check.ts) for as long as both exist.
+   Findings, how to run both and how to compare their outputs:
+   `tools/edge-bench-rs/README.md`.
    Per lease: compressed chunks of 10–50 k lines, in order →
    parse subjects → skip crossposts outside their owner group (of the
    indexed groups in the article's Xref, the one with the lowest priority