Index: binaries/data/mods/mod/gui/gui.rnc
===================================================================
--- binaries/data/mods/mod/gui/gui.rnc  (revision 19351)
+++ binaries/data/mods/mod/gui/gui.rnc  (working copy)
@@ -150,11 +150,12 @@ column =
     translatableAttribute?,
     (
     attribute id { text }&
     attribute color { ccolor }?&
     attribute heading { text }?&
-    attribute width { text }?
+    attribute width { text }?&
+    attribute hidden { bool }?
     )
   }
 \include =
   element include {
    attribute file { text }|