Document some obscurities. All regression tests pass.

1 files changed, 4 insertions, 0 deletions

diff --git a/gpsdctl.c b/gpsdctl.c
index 08a78216..0332df9f 100644
--- a/gpsdctl.c
+++ b/gpsdctl.c
@@ -88,6 +88,10 @@ static int gpsd_control(char *action, char *argument)
      * We've got a live connection to the gpsd control socket.  No
      * need to parse the response, because gpsd will lock on to the
      * device if it's really a GPS and ignore it if it's not.
+     *
+     * The only other place in the code that knows about the format of
+     * these commands is the handle_control() function in gpsd.c. Be careful
+     * about keeping them in sync, or hotplugging will have nysterious failures.
      */
     if (strcmp(action, "add") == 0) {
 	/*