diff --git a/slackHook.d.ts b/slackHook.d.ts
index 2ba3b7c..3cfb74c 100644
--- a/slackHook.d.ts
+++ b/slackHook.d.ts
@@ -21,7 +21,7 @@ declare namespace SlackHook {
         channel?: string;
     }
 
-    interface SlackHookOptions {
+    interface SlackHookOptions extends TransportStreamOptions {
         /**
          * Slack incoming webhook URL.
          *