diff --git a/htmltojsx/htmltojsx.d.ts b/htmltojsx/htmltojsx.d.ts
index 06040a67c2..5f32304b8a 100644
--- a/htmltojsx/htmltojsx.d.ts
+++ b/htmltojsx/htmltojsx.d.ts
@@ -8,6 +8,8 @@ declare module 'htmltojsx' {
         constructor(options?: {
             createClass?: boolean;
             outputClassName?: string;
+            /** as a string e.g. '    ' or '\t' */
+            indent?: string;
         });
         convert(html: string): string;
     }