diff --git a/README.md b/README.md
index 732543e..8fac180 100644
--- a/README.md
+++ b/README.md
@@ -13,10 +13,11 @@ Screen background is filled with a scaled version of the image to prevent pure b
 ## Usage
 
 ```
-slide [-t rotation_seconds] [-o background_opacity(0..255)] [-b blur_radius] -p image_folder
+slide [-t rotation_seconds] [-o background_opacity(0..255)] [-b blur_radius] -p image_folder -r
 ```
 
-* `image_folder`: where to search for images (.jpg files), currently non-recursively
+* `image_folder`: where to search for images (.jpg files)
+* `-r` for recursive traversal for `image_folder`
 * `rotation_seconds(default=30)`: time until next random image is chosen from the given folder
 * `background_opacity(default=150)`: opacity of the background filling image between 0 (black background) and 255
 * `blur_radius(default=20)`: blur radius of the background filling image