diff --git a/README.md b/README.md
index ff9cf52..c86dc08 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,8 @@ For flatpak, Docker, and AppImage versions, refer to the wiki: https://github.co
     On 7th gen and later Kindles running firmware 5.15.1+, you can get cover thumbnails simply by USB dropping into documents folder.
     On 6th gen and older, you can get cover thumbnails by keeping Kindle plugged in during conversion.
     If you are careful to not modify the file however, you can still use Calibre, but direct USB dropping is reccomended.
+- What output format should I use?
+  - MOBI for Kindles. CBZ for Kindle DX. CBZ for Koreader. KEPUB for Kobo.
 - All options have additional information in tooltips if you hover over the option.
 - To get the converted book onto your Kindle/Kobo, just drag and drop the mobi/kepub into the documents folder on your Kindle/Kobo via USB
 - Right to left mode not working?