--- a/Hats.wiki	Fri Sep 20 01:11:08 2019 +0100
+++ b/Hats.wiki	Sun Sep 29 20:48:15 2019 +0100
@@ -17,7 +17,7 @@
 Examples for team hats in the default Hedgewars installation are `cap_team` and `hair_team`.
 
 == Data structure ==
-Hats are specified as PNG files with alpha channel.
+Hats are specified as PNG files with alpha channel (transparency).
 They consist of a set of sub-images of a size 32px×32px each.
 Hedgewars counts the sub-images, or animation frames, from top-left to
 bottom-left, then it goes on with the next column, etc.