Made explicit mention of a few examples in the narrative about selection.

kivy/uix/listview.py

@@ -438,14 +438,18 @@ on_selection_change event::
 
     list_adapter.bind(on_selection_change=callback_function)
 
-where callback_function() does whatever is needed for the update.
+where callback_function() does whatever is needed for the update. See the
+example called list_master_detail.py, and imagine that the list one the left
+would be a list of dog breeds, and the detail view on the right would show
+details for a selected dog breed.
 
 In another example, we could set the selection_mode of a listview to
 'multiple', and load it with a list of answers to a multiple-choice question.
 The question could have several correct answers. A color swatch view could be
 bound to selection change, as above, so that it turns green as soon as the
 correct choices are made, unless the number of touches exeeds a limit, when the
-answer session would be terminated.
+answer session would be terminated. See the examples that feature thumbnail
+images to get some ideas, e.g., list_cascade_dict.py.
 
 In a more involved example, we could chain together three listviews, where
 selection in the first controls the items shown in the second, and selection in