diff --git a/plans/lib-guest.md b/plans/lib-guest.md
index b9853b20..81921e7d 100644
--- a/plans/lib-guest.md
+++ b/plans/lib-guest.md
@@ -153,7 +153,7 @@ Extract from `haskell/infer.sx`. Algorithm W or J, generalisation, instantiation
 |------|--------|--------|-------|
 | 0 — baseline snapshot | [done] | 2f7f8189 | 11 guests captured: lua 185/185, forth 64/64, ruby 76/76, apl 73/73, prolog 590/590, common-lisp 309/309, smalltalk 625/629, tcl 3/4, haskell 0/18 programs, js 94/148 (slice), erlang 0/0 |
 | 1 — conformance.sx (prolog + haskell) | [done] | 58dcff26 | Prolog 590/590 (matches baseline). Haskell 156/156 — old script was broken (0/18 was an artefact of a never-matching grep), driver reveals true counts; baseline updated. |
-| 2 — prefix.sx (common-lisp + lua) | [ ] | — | — |
+| 2 — prefix.sx (common-lisp + lua) | [in-progress] | — | — |
 | 3 — lex.sx (lua + tcl) | [ ] | — | — |
 | 4 — pratt.sx (lua + prolog) | [ ] | — | — |
 | 5 — ast.sx (lua + prolog) | [ ] | — | — |