diff --git a/src/PIL/ImageShow.py b/src/PIL/ImageShow.py
index f7920692159..6109f0bcfac 100644
--- a/src/PIL/ImageShow.py
+++ b/src/PIL/ImageShow.py
@@ -25,7 +25,12 @@
 
 def register(viewer, order=1):
     """
-    The :py:func:`register` function is used to register additional viewers.
+    The :py:func:`register` function is used to register additional viewers::
+
+        from PIL import ImageShow
+        ImageShow.register(MyViewer())  # MyViewer will be used as a last resort
+        ImageShow.register(MySecondViewer(), 0)  # MySecondViewer will be prioritised
+        ImageShow.register(ImageShow.XVViewer(), 0)  # XVViewer will be prioritised
 
     :param viewer: The viewer to be registered.
     :param order: