diff --git a/README.rst b/README.rst
index 9c767e0..fd6f27b 100644
--- a/README.rst
+++ b/README.rst
@@ -132,6 +132,7 @@ Other options:
       # Generating options
       --html                generate a html viewer at current directory
       --no-html             don't generate HTML after downloading
+      --gen-main            generate a main viewer contain all the doujin in the folder
       -C, --cbz             generate Comic Book CBZ File
       --rm-origin-dir       remove downloaded doujinshi dir when generated CBZ
                             file.