diff --git a/index.d.ts b/index.d.ts
index 30b8f48..0697b45 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -193,7 +193,7 @@ declare module "flexsearch" {
         commit?: boolean;
 
         // Language-specific Options and Encoding
-        encoder?: typeof Charset | Encoders | EncoderOptions;
+        encoder?: typeof Charset | Encoders | EncoderOptions | Encoder;
         encode?: (text: string) => string[],
         rtl?: boolean;
     };