- "Set to a list if the XTerm supports modifyOtherKeys or
-reporting the background color. Set to 'check to check for those
-features. Set to nil to skip the checks."
+ "Whether Xterm supports some additional, more modern, features.
+If nil, just assume that it does not.
+If `check', try to check if it does.
+If a list, assume that the listed features are supported, without checking.
+
+The relevant features are:
+ modifyOtherKeys -- if supported, more key bindings work (e.g., \"\\C-,\")
+ reportBackground -- if supported, Xterm reports its background color
+"
+ :version "24.1"