From 52d3001130a64ded8da64721bf73b90e6fbe924f Mon Sep 17 00:00:00 2001
From: Julien Laffaye <jlaffaye@FreeBSD.org>
Date: Thu, 11 Apr 2019 17:57:07 +0200
Subject: [PATCH] Specify that a server conn is not concurrent safe.

Fixes #128
---
 ftp.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ftp.go b/ftp.go
index afaffca..13214e3 100644
--- a/ftp.go
+++ b/ftp.go
@@ -27,7 +27,8 @@ const (
 )
 
 // ServerConn represents the connection to a remote FTP server.
-// It should be protected from concurrent accesses.
+// A single connection only supports one in-flight data connection.
+// It is not safe to be called concurrently.
 type ServerConn struct {
 	options *dialOptions
 	conn    *textproto.Conn