Classes: \helpref{wxImageList}{wximagelist}
-TODO.
+An image list is a list of images that may have transparent areas.
+The class helps an application organise a collection of images
+so that they can be referenced by integer index instead of by
+pointer.
+
+Image lists are used in \helpref{wxNotebook}{wxnotebook},
+\helpref{wxListCtrl}{wxlistctrl}, \helpref{wxTreeCtrl}{wxlistctrl} and
+some other control classes.