diff --git a/README.md b/README.md
index 07f0e13..9fef2d8 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ Many little improvements have been made to i3lock over time:
      - `-k, --clock` -- enables the clock display.
      - `--timestr="%H:%M:%S"` -- allows custom overriding of the time format string. Accepts `strftime` formatting. Default is `"%H:%M:%S"`.
      - `--datestr="%A, %m %Y"` -- allows custom overriding of the date format string. Accepts `strftime` formatting. Default is `"%A, %m %Y"`.
+     - `-B, --blur` -- enables capturing the display and blurring for use as a background image.
   - All the colors have an alpha channel now. Please keep in mind that this was not intended when the program was originally written, so making things transparent that weren't before can make it look strange.
 
 - You can specify whether i3lock should bell upon a wrong password.