diff --git a/index.d.ts b/index.d.ts
index b64ad05..848352f 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -2,6 +2,6 @@ export interface IDetectedMap {
     encoding: string,
     confidence: number
 }
-export function detect(buffer: Buffer, options?: { minimumThreshold: number }): IDetectedMap;
+export function detect(buffer: Buffer | Uint8Array, options?: { minimumThreshold: number }): IDetectedMap;
 
 export function enableDebug(): void;