diff --git a/README.md b/README.md
index 0dc62301..3ca3412f 100644
--- a/README.md
+++ b/README.md
@@ -99,7 +99,7 @@ On Linux use `./darknet` instead of `darknet.exe`, like this:`./darknet detector
 * 186 MB Yolo9000 - image: `darknet.exe detector test cfg/combine9k.data yolo9000.cfg yolo9000.weights`
 * Remeber to put data/9k.tree and data/coco9k.map under the same folder of your app if you use the cpp api to build an app
 * To process a list of images `data/train.txt` and save results of detection to `result.txt` use:                             
-    `darknet.exe detector test data/voc.data yolo-voc.cfg yolo-voc.weights -dont_show < data/train.txt > result.txt`
+    `darknet.exe detector test data/voc.data yolo-voc.cfg yolo-voc.weights -dont_show -ext_output < data/train.txt > result.txt`
     You can comment this line so that each image does not require pressing the button ESC: https://github.com/AlexeyAB/darknet/blob/6ccb41808caf753feea58ca9df79d6367dedc434/src/detector.c#L509
 
 ##### For using network video-camera mjpeg-stream with any Android smartphone: