diff --git a/AGENTS.md b/AGENTS.md
index fbcebbe..40c58a6 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -144,8 +144,10 @@ repo is in PLAN.md's "Backend layout" section.
   home's `~/files` holding the states that are otherwise only reachable by
   finding a real machine in one: an empty directory, a name with a tab in
   it and one with an apostrophe, a binary file, one over `FILE_LIMIT`, one
-  `chmod 000`, a symlink to a directory and a broken one, and a source file
-  per language. Point a session at it with
+  `chmod 000`, a symlink to a directory and a broken one, a source file per
+  language, and the three sizes the limits were measured against
+  (`edit-32k.rs`, `edit-128k.rs`, `big-source.rs`), so those figures can be
+  taken again rather than re-derived. Point a session at it with
   `./ui-sandbox.sh api /sessions/<id>/cwd -X POST -H 'content-type: application/json' -d '{"cwd":"~/files"}'`.
   The 409 is produced by editing the file on the machine (`printf … > file`)
   between pressing the pencil and pressing save.