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-rw-r--r--docs/fs.md4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/fs.md b/docs/fs.md
index 5de73b86..70a76c92 100644
--- a/docs/fs.md
+++ b/docs/fs.md
@@ -253,7 +253,9 @@ takes (`Verbose on`, `WindowOpacity 70`, `PanelSlide off`, `DumpDir
<the directory in effect>`, `LocationsConfig ...`), so writing what it reads
back changes nothing; a setting the frontend cannot show (`Lift`,
`GripWidth` on a terminal) is refused as `Lift is GUI-only, invalid here`
-(EINVAL: a request this build cannot take); a `Shell` or `Tty` naming no
+(EINVAL: a request this build cannot take), and so is a builtin only the
+GUI has (`Fonts`), written to an `exec` too, where it would otherwise run as
+a shell command; a `Shell` or `Tty` naming no
shell says `no shell "x", not found` (ENOENT); a `DumpDir` whose last
directory is missing has it made at the Dump, and one further up missing
says `Dump <path>: no such directory` (ENOENT), one that is no directory