diff --git a/web/src/types/reader.d.ts b/web/src/types/reader.d.ts
index e153c66..0e72490 100644
--- a/web/src/types/reader.d.ts
+++ b/web/src/types/reader.d.ts
@@ -209,6 +209,7 @@ interface ReaderSettings {
 
   double_page_spread: boolean;
   reading_direction: "ltr" | "rtl" | "vertical";
+  reading_mode: "dark" | "light";
 
   pdf_fit_mode: "fit-width" | "fit-page" | "fit-height" | "none";
   pdf_zoom_level: number;