diff --git a/kivy/atlas.py b/kivy/atlas.py
index 9b65951a8..c893ca3d7 100644
--- a/kivy/atlas.py
+++ b/kivy/atlas.py
@@ -81,7 +81,10 @@ You can combine all the png's into one and generate the atlas file with::
     myatlas-0.png
 
 As you can see, we get 2 new files: ``myatlas.atlas`` and ``myatlas-0.png``.
-``myatlas-0.png`` is a new 256x256 .png composed of all your images.
+``myatlas-0.png`` is a new 256x256 .png composed of all your images. If the
+size you specify is not large enough to fit all of the source images, more
+atlas images will be created as required e.g. ``myatlas-1.png``,
+``myatlas-2.png`` etc.
 
 .. note::
 
@@ -234,7 +237,9 @@ class Atlas(EventDispatcher):
             `filenames`: list
                 List of filenames to put in the atlas.
             `size`: int or list (width, height)
-                Size of the atlas image.
+                Size of the atlas image. If the size is not large enough to
+                fit all of the source images, more atlas images will created
+                as required.
             `padding`: int, defaults to 2
                 Padding to put around each image.