model_viewer: update README with usage info

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/contrib/model_viewer/README.md b/contrib/model_viewer/README.md
index abbcecf..5c91a58 100644 (file)
--- a/contrib/model_viewer/README.md
+++ b/contrib/model_viewer/README.md
@@ -8,7 +8,15 @@ It renders the earth with an displaced surface, a cloud layer, city lights and P
 
 # Variations
 
-* The standard application is compiled to a desktop executable at `bin/model_viewer` and an Android package at `bin/model_viewer.apk`.
+* For the desktop, the application is compiled to `bin/model_viewer`.
+
+       This variation can show more models specified on the command line.
+
+       ~~~
+       bin/model_viewer [path_to_model ...]
+       ~~~
+
+* For Android, the standard application is compiled to `bin/model_viewer.apk`.
 * The virtual reality variant `bin/model_viewer_vr.apk` targets Android and uses Google Cardboard for head tracking.
 
 # Art