Update README.md

README.md

@@ -47,6 +47,10 @@ Advanced Usage -- Common Tasks
 
   ``gogrepo.py update -os windows -lang en de -skipknown``
 
+* Update games with the updated tag in your libary.
+
+  ``gogrepo.py update -os windows -lang en de -updateonly``
+
 * Update a single game in your manifest.
 
   ``gogrepo.py update -os windows -lang en de -id trine_2_complete_story``
@@ -75,7 +79,7 @@ update or download command. Run this once first before doing update and download
     -os [OS [OS ...]]     operating system(s) (ex. windows linux mac)
     -lang [LANG [LANG ...]]  game language(s) (ex. en fr de)
     -skipknown            only update new games in your library
-    -skipknown            only update games with the update tag in your library
+    -updateonly           only update games with the updated tag in your library
     -id <title>           specify the game to update by 'title' from the manifest
                           <title> can be found in the !info.txt of the game directory