diff --git a/index.d.ts b/index.d.ts
index 9a25004..d8d98a6 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -4,7 +4,7 @@
 export = Mailchimp;
 
 declare class Mailchimp {
-  constructor(api: string)
+  constructor(api: string, dc?: string)
 
   get(
     pathOrOptions: PathOrOptions,