diff --git a/index.d.ts b/index.d.ts
index 4368765d..b080e763 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -14,6 +14,8 @@ export type ReadableStreamWithFileType = NodeReadableStream & {
 Extending `FileTypeParser` with Node.js engine specific functions.
 */
 export declare class NodeFileTypeParser extends FileTypeParser {
+	constructor(options?: {customDetectors?: Iterable<Detector>});
+
 	/**
 	@param stream - Node.js `stream.Readable` or web `ReadableStream`.
 	*/