diff --git a/kivy/uix/scatter.py b/kivy/uix/scatter.py
index 9dc88d89b..856e94871 100644
--- a/kivy/uix/scatter.py
+++ b/kivy/uix/scatter.py
@@ -492,6 +492,9 @@ class Scatter(Widget):
 
 
 class ScatterPlane(Scatter):
+    '''This is essentially an unbounded Scatter widget, convenience
+       class to make easier the writting of infinite planes
+    '''
 
     def __init__(self, **kwargs):
         kwargs.setdefault('auto_bring_to_front', False)