diff --git a/README.md b/README.md
index 5e0419cf..20fda1e2 100644
--- a/README.md
+++ b/README.md
@@ -103,7 +103,7 @@ The `options` argument may either be a string URI of the proxy server to use, or
 
   * `host` - String - Proxy host to connect to (may use `hostname` as well). Required.
   * `port` - Number - Proxy port to connect to. Required.
-  * `secureProxy` - Boolean - If `true`, then use TLS to connect to the proxy. Defaults to `false`.
+  * `protocol` - String - If `https:`, then use TLS to connect to the proxy.
   * `headers` - Object - Additional HTTP headers to be sent on the HTTP CONNECT method.
   * Any other options given are passed to the `net.connect()`/`tls.connect()` functions.