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-rw-r--r--docs/fs.md6
1 files changed, 5 insertions, 1 deletions
diff --git a/docs/fs.md b/docs/fs.md
index c08500f1..5c06d206 100644
--- a/docs/fs.md
+++ b/docs/fs.md
@@ -135,7 +135,11 @@ generated from the registry, so it is always this build's own list.
`/focus` reads the serial of the pane with the keyboard, and a serial written
to it gives that pane the keyboard, off any column or workspace tag that had
it -- rio's `current` written to a window's `wctl`, named once for the whole
-tree since there is one keyboard. A serial no pane has fails with `no such
+tree since there is one keyboard. While a column's or the workspace's tag has
+the keyboard no pane does: `/focus` reads empty and every pane's `ctl` says
+`notcurrent`. A write gives the keyboard and nothing else: a folded pane
+stays folded (unfold it with `Collapse` on its ctl), as rio keeps `current`
+apart from `unhide`. A serial no pane has fails with `no such
window`; anything but a number, with `ill-formed control message`.
A pane is made by **opening** `/pane/new`, and closed by Tremove on