diff --git a/index.d.ts b/index.d.ts
index af3fd8115b..0abd7518be 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -14,6 +14,10 @@ export interface AxiosBasicCredentials {
 export interface AxiosProxyConfig {
   host: string;
   port: number;
+  auth?: {
+    username: string;
+    password:string;
+  }
 }
 
 export interface AxiosRequestConfig {