--- a/PresetMaps.wiki	Thu Jun 06 09:58:38 2013 +0000
+++ b/PresetMaps.wiki	Thu Jun 06 20:38:38 2013 +0000
@@ -35,7 +35,7 @@
 === map.cfg ===
 Configuration file.
 
-  * First line is the name of the [Theme] used by the map (for background and clouds, flakes, water, etc)
+  * First line is the name of the [Theme] used by the map (for background and clouds, flakes, water, etc).  As of 0.9.19+, this theme may be overridden when setting up the game.
   * Second line is max. number of hedgehogs supported. If the second line is not provided, it is assumed to be 18
 
 
@@ -47,6 +47,7 @@
   * Typical size: 2048 x 1024
   * Max size: no limit, 0.9.18+.  4096 x 2048 or less in 0.9.17 and earlier.
   * If there is no _mask.png_, this image will also be used for deciding what pixels are subject to collision: _alpha value_ not equal to 0 (so below max transparency) will be considered land
+  * As of 0.9.19+, map.png is optional if a mask.png is provided.  If there is no map.png, the theme will be used to decorate the map.
 
 === preview.png ===
 Preview image of the map