diff --git a/REBUILD.md b/REBUILD.md
index 0b32822..6415663 100644
--- a/REBUILD.md
+++ b/REBUILD.md
@@ -1,4 +1,9 @@
-# Rebuild: header-first indexer (spec, draft for approval)
+# Voyager 2: header-first indexer (concept)
+
+The concept for what runs (since 2026-10-11; it started as the spec of a
+rebuild, then a draft for approval). Voyager 1's CONCEPT.md and its
+decisions D1–D42 are superseded; its domain model still holds, and its
+features not yet here are the phase 2 backlog below.
 
 Branch `rebuild`. Phase 1 finds releases from headers and makes their NZBs.
 Everything learned from articles (names from yEnc headers, par2, archive
@@ -203,11 +208,31 @@ of other groups whose counts show crossposts skipped for it (part 5). Start:
 the 1000 largest `alt.binaries.*` groups by LIST ACTIVE (~266 k ranges of
 2 M articles; boneless alone 80 k).
 
-## Not in phase 1
+## Phase 2
 
-Inspection and archive walks, par2/SFV naming, spots, NZB imports, the
-after-probe garbage deletes, live indexing (the current indexer keeps
-running and does those meanwhile).
+Built: the prober (2026-10-11; `probe:run`, LOG.md 2026-10-11 (2)). It
+reads the probe queue's first articles (`lone`, `par2`, `archive`) and
+stores per release whether it's passworded and its inner name, which search,
+the web interface and Newznab use.
+
+**Backlog: voyager 1's features not in voyager 2** (CONCEPT.md decisions;
+voyager 1's data exported to `/mnt/bulk/usenet-rebuild/v1-export/` on
+homelab: `voyager1-tables.dump` with 2.76 M spots, upload signatures,
+signature probes, dropped releases and groups; `voyager1-release-passwords.csv`
+with 68,032 releases with a password):
+
+| Feature | Voyager 1 | In voyager 2 |
+|---|---|---|
+| Spotnet spots | D29 | not yet; 2.76 M spots in the export |
+| Posted NZBs read into releases (also NZBs inside archives) | D26, D28 | not yet |
+| Passwords (from spots, NZB meta, names) | D29, D26 | only *whether* passworded (the prober); the export's 68 k passwords not imported |
+| SFV grouping and naming | D34 | not yet (SFV files aren't probe candidates) |
+| Complete RAR listings by walking volume headers | D40 | no: the prober reads the first volume's first article only |
+| 7z listings | D19 | no: `7z-tail` candidates are queued, not probed |
+| Names from yEnc bodies for obfuscated subjects | D13, D21, D36 | no: obfuscated and per-article subjects are only counted (part 5); their message-ids aren't stored, so a body path needs those ranges read again |
+| Garbage dropped after probing (no real name, no password) | D42 (its second filter) | not yet; the header-time garbage rules are in (part 5) |
+
+Live indexing (the tail) runs since 2026-10-09.
 
 ## Decisions