diff --git a/README.md b/README.md
index fba3cd1..b120992 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ Usage
 		 -W width : V4L2 capture width (default 640)
 		 -H height: V4L2 capture height (default 480)
 		 -F fps   : V4L2 capture framerate (default 25, 0 disable setting framerate)
+                 -G <w>x<h>[x<f>] : V4L2 capture format (default 0x0x25)
 		 
 		 ALSA options :
 		 -A freq    : ALSA capture frequency and channel (default 44100)