diff --git a/src/types/index.ts b/src/types/index.ts
index bf26d5e..fad9b5b 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -13,8 +13,10 @@ export interface AdapterAPI {
   seek?: (time: number) => void;
   currentTime?: () => number;
   duration?: () => number;
-  volume?: () => number;
-  mute?: () => boolean;
+  volume?: (volume: number) => void;
+  currentVolume?: () => number;
+  muted?: () => boolean;
+  mute?: (muted?: boolean) => void;
 }
 
 export interface PlayerConfig {