diff --git a/README-test-server b/README-test-server
index cb9e6b5..1cb8e84 100644
--- a/README-test-server
+++ b/README-test-server
@@ -159,6 +159,19 @@
 by --protocol=protocolname
 
 
+proxy support
+-------------
+
+The http_proxy environment variable is respected by the client
+connection code for both ws:// and wss://.  It doesn't support
+authentication yet.
+
+You use it like this
+
+export http_proxy=myproxy.com:3128
+libwebsockets-test-client someserver.com
+
+
 Websocket version supported
 ---------------------------