--- a/ThemeCfg.wiki	Thu Mar 15 14:23:08 2018 +0000
+++ b/ThemeCfg.wiki	Thu Mar 22 15:58:53 2018 +0000
@@ -19,6 +19,9 @@
 
 Literally all lines in the `theme.cfg` file are optional, thus an empty file is valid. Everything has a default value. However, some default values are not really useful (e.g. the water or sky color) and you should therefore explicitly specify enough values.
 
+== `hidden` (0.9.24) ==
+If this key is present in `theme.cfg` (the value does not matter), the theme will be hidden from the theme selection menu. Background themes *must* be hidden.
+
 == `sky` ==
 The colour of the sky.