diff --git a/README.md b/README.md
index cb78bbf..49e3609 100644
--- a/README.md
+++ b/README.md
@@ -242,7 +242,7 @@ supported codes:
 
 - `--gzip`   enables gzip compression for responses.
 - `--max=N`  allows to set the maximum size of request (default 64k). Setting it to `0` disables the size check.
-- `--timeout.*` various timeouts for both server and proxy transport. See `timeout` section in [All Application Options](#all-application-options)
+- `--timeout.*` various timeouts for both server and proxy transport. See `timeout` section in [All Application Options](#all-application-options). A zero or negative value means there will be no timeout.
 
 ## Default ports