Update index.md

Author: torumyax

docs/index.md

@@ -21,6 +21,7 @@ Simple, minimum, yet configurable photo viewer/slideshow/digital signage softwar
 * Multiple viewing styles: 1. Normal window view, 2. "Windowless" view with slideshow, and 3. Fullscreen view with slideshow.   
 * Full keyboard and mouse playback control. 
 * Configurable options with command line parameters and popup menus.  
+* Supports multiple moniters.  
 
 ### Usage:  
 Image Viewer can be launched by (1) double clicking the executable and selecting image files or (2) selecting image files or folders in the explorer, and using "send to" feature in Windows explorer (create "shortcut" file and place it to "shell:sendto" folder) or (3) command-line.