diff --git a/index.d.ts b/index.d.ts
index 91f8d83..1283901 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,4 +1,4 @@
 export = showBanner;
 
-declare function showBanner(title: string, tagLine?: string, titleColor?: string): Promise<void>;
+declare function showBanner(title: string, tagLine?: string, titleColor?: string, tagLineColor?: string): Promise<void>;