--- a/ThemeFiles.wiki	Sun Dec 07 16:22:26 2014 +0000
+++ b/ThemeFiles.wiki	Sun Dec 07 16:23:37 2014 +0000
@@ -2,7 +2,9 @@
 <wiki:toc max_depth="3" />
 
 = File structure of themes =
-This page explains the meaning of the several files which are used by themes. Please note that not all files are neccessary to create a theme, many files have default fallback versions with identical names in `Data/Graphics` of your Hedgewars installation. To create a theme, you need a bunch of graphics and a `theme.cfg` (explained under [Theme]).
+This page explains the meaning of the several files which are used by themes. Please note that not all files are neccessary to create a theme, many files have default fallback versions with identical names in `Data/Graphics` of your Hedgewars installation.
+
+To create a theme, you need a bunch of graphics and a `theme.cfg` (explained under [Theme]). All graphics mentioned here have to in the PNG format.
 
 Please note that this is not a tutorial, it is a reference page designed to look up how to do stuff.