diff --git a/src/openvpn/proxy.c b/src/openvpn/proxy.c
index ed7201616..633caee09 100644
--- a/src/openvpn/proxy.c
+++ b/src/openvpn/proxy.c
@@ -519,6 +519,8 @@ http_proxy_new(const struct http_proxy_options *o)
 #if NTLM
         else if (!strcmp(o->auth_method_string, "ntlm"))
         {
+            msg(M_INFO, "NTLM v1 authentication is deprecated and will be removed in "
+                "OpenVPN 2.7");
             p->auth_method = HTTP_AUTH_NTLM;
         }
         else if (!strcmp(o->auth_method_string, "ntlm2"))