ttyacm-multiplex: Add a comment say what this thing is

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/ttyacm-multiplex b/ttyacm-multiplex
index 3a576af3bf204e740fd5e53fc017acf1229b9728..d8f91c31adad2ce5fc95bd6451323f77aaac0555 100755 (executable)
--- a/ttyacm-multiplex
+++ b/ttyacm-multiplex
@@ -5,6 +5,9 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 # There is NO WARRANTY.
 
+# This is unfinished attempt at a program to multiplex multiple
+# clients all wanting to speak to a /dev/ttyACM GSM modem / GPS.
+
 set expected_devs 3
 
 proc debug {m} { puts "DEBUG $m" }