diff --git a/Usage.md b/Usage.md
index 7f047f4..91a3ec0 100644
--- a/Usage.md
+++ b/Usage.md
@@ -5,7 +5,7 @@ A curses library with wide char support (e.g. ncursesw), libc and libreadline (o
 | Utility deps | Install? | Operation |
 | --- | --- | --- |
 | xdg-open (Linux), open(1) (macOS), cygstart (Cygwin), open (Haiku) | base | default opener |
-| file, coreutils (cp, mv, rm), xargs, sed | base | file type, copy, (re)move |
+| file, coreutils (cp, mv, rm), xargs, sed (GNU sed on macOS) | base | file type, copy, (re)move |
 | tar, (un)zip [atool/bsdtar for more formats] | base | create, list, extract bzip2, (g)zip, tar |
 | archivemount, fusermount(3)/umount (macOS) | optional | (un)mount archives |
 | sshfs, [rclone](https://rclone.org/), fusermount(3)/umount (macOS) | optional | (un)mount remotes |