--- r1/docs/TOOLS.md
+++ r2/docs/TOOLS.md
@@ -175,10 +175,13 @@
 path from the checkout. On a pinned host, `mosaic` on PATH is a wrapper
 around a pinned copy's `scripts/mosaic`
 ([Stack copies](#stack-copies-scriptsstack-copysh)) and carries the human
-commands. Queue commands stay on `scripts/mosaic queue` in the canonical
-checkout, because a copy refuses them. Exit codes: the launch script's own
-once it runs; before that 1 could not start, 2 invalid config or seat, 4
-usage. Details and the record's fields: `packages/seat/README.md`.
+commands; on Jason's host the estate CLI it replaced is `mosaic-old`.
+Queue commands stay on `scripts/mosaic queue` in the canonical checkout,
+because a copy refuses them ([One pinned
+copy](../packages/cli/README.md#one-pinned-copy-row-85-1579)). Exit
+codes: the launch script's own once it runs; before that 1 could not
+start, 2 invalid config or seat, 4 usage. Details and the record's
+fields: `packages/seat/README.md`.
 
 ## Work queue (`scripts/mosaic queue`)
 
--- r1/packages/queue/tests/dispatch.test.mjs
+++ r2/packages/queue/tests/dispatch.test.mjs
@@ -102,8 +102,9 @@
 test("the pre-A2 fixture is the script A2 changed", () => {
   const fixture = readFileSync(join(HERE, "fixtures", "mosaic-pre-a2.sh"), "utf8");
   const now = readFileSync(join(SCRIPTS, "mosaic"), "utf8");
-  // A2 adds lines and removes none. Comment lines are left out: later rows
-  // rewrite the header (row 70), and the pin is on what the script runs.
+  // A2 adds lines and removes none. Lines that start with "# " are left out:
+  // later rows rewrite the header (row 70), and the pin is on what the script
+  // runs. The shebang and any other line stay in.
   const code = (s) => s.split("\n").filter((l) => !l.startsWith("# "));
   const lines = code(now);
   let i = 0;
--- r1/packages/seat/README.md
+++ r2/packages/seat/README.md
@@ -12,7 +12,8 @@
 
 The repository wrapper is `scripts/mosaic`; run it by path from the
 checkout. A host may also put `mosaic` on PATH as a wrapper around a
-pinned copy's `scripts/mosaic` (`scripts/stack-copy.sh wrapper`). On
+pinned copy's `scripts/mosaic` (`scripts/stack-copy.sh wrapper`, see
+[docs/TOOLS.md, Stack copies](../../docs/TOOLS.md#stack-copies-scriptsstack-copysh)). On
 Jason's host the estate CLI it replaced is `mosaic-old`, which has no
 `launch` or `seat` command. On a pinned host the human commands go
 through `mosaic` on PATH, and queue commands stay on `scripts/mosaic
--- r1/scripts/mosaic
+++ r2/scripts/mosaic
@@ -10,7 +10,8 @@
 # This is the repository wrapper; run it by path from the checkout. A host
 # may also put `mosaic` on PATH as a wrapper that runs a pinned copy's
 # scripts/mosaic (scripts/stack-copy.sh wrapper, docs/TOOLS.md "Stack
-# copies"). On a pinned host the human commands and --tester go through
+# copies"). On Jason's host the estate CLI it replaced is `mosaic-old`.
+# On a pinned host the human commands and --tester go through
 # that `mosaic`, and from a checkout they exit 3. Queue commands stay on
 # scripts/mosaic queue in the canonical checkout, because a copy refuses
 # them. See packages/cli/README.md "One pinned copy".