Update README.md

Author: rv-kip

README.md

@@ -1,6 +1,6 @@
 node-image-size-scanner
 =======================
-For a given URL, report image file sizes and paths. Optionally you may specify a minimum file size to report on. Formatted output or json output.
+For a given URL, report image file sizes and paths sorted by decreasing size. Optionally you may specify a minimum file size to report on. Formatted output or json output.
 
 ## Installation ##
 `npm install -g node-image-size-scanner`
@@ -28,4 +28,4 @@ $ image_check -u https://www.google.com -b 1k -j
        bytes: 8228 },
      { image_url: 'https://www.google.com/images/icons/product/chrome-48.png',
        bytes: 1834 } ] }
-```
+```