diff --git a/tunnels.cfg.md b/tunnels.cfg.md
index c0e7621..161af5f 100644
--- a/tunnels.cfg.md
+++ b/tunnels.cfg.md
@@ -60,6 +60,10 @@ Server/http tunnels
 
 'http' tunnel works same way as server tunnel, but replace 'Host:' field in HTTP header to address provided in configuration.  Also resolves it if necessary.
 
+Optional parameters:
+
+'hostoverride' - to send in 'Host:' header if different from 'host'. 
+
 Example of http tunnel:
 
     [http-in]