send-email: fix threaded mails without chain-reply-to

diff --git a/connect.c b/connect.c
index f6b8ba6fec16ed2ff2de4c66e2465e79d059a817..958c831e430340435c31b640bd757d56b7cb8b71 100644 (file)
--- a/connect.c
+++ b/connect.c
@@ -579,7 +579,10 @@ struct child_process *git_connect(int fd[2], const char *url_orig,
                        git_tcp_connect(fd, host, flags);
                /*
                 * Separate original protocol components prog and path
-                * from extended components with a NUL byte.
+                * from extended host header with a NUL byte.
+                *
+                * Note: Do not add any other headers here!  Doing so
+                * will cause older git-daemon servers to crash.
                 */
                packet_write(fd[1],
                             "%s %s%chost=%s%c",