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-rw-r--r--docs/fs.md5
1 files changed, 4 insertions, 1 deletions
diff --git a/docs/fs.md b/docs/fs.md
index 36fc7d7a..8e70af3e 100644
--- a/docs/fs.md
+++ b/docs/fs.md
@@ -496,7 +496,10 @@ selection, and leaves `look` reading back empty.
`/pane/<n>/name` reads the pane's file name (a terminal's directory) and
writing it renames the buffer; a relative name resolves against the pane's
-directory. `body` appends on write and replaces on truncating open. A
+directory. The write is the name and its newline, nothing trimmed: a blank
+inside a name is taken (`two words.zig`), but one at either end, or a
+control character, is refused, `bad character in file name` (EINVAL), as
+acme refuses a blank (xfid.c:650), rather than quietly cut off. `body` appends on write and replaces on truncating open. A
terminal's `body` is its history as plain text, frozen per open, in logical
lines: a row the terminal wrapped is joined back to the row before it (the
wrap is ghostty's, as `pty/run`'s output unwraps), and the last line ends