slight edits to docs as suggested by @mdboom

tacaswell · tacaswell · commit ea60427f0041 · 2014-01-20T21:08:11.000-05:00
diff --git a/lib/matplotlib/axes.py b/lib/matplotlib/axes.py
@@ -7247,9 +7247,9 @@ def imshow(self, X, cmap=None, norm=None, aspect=None,
             corner of the axes. If None, default to rc `image.origin`.
 
         extent : scalars (left, right, bottom, top), optional, default: None
-            The location, in data-coordinates, of the lower-left and upper-right corners
-            of the image.  If `None`, and extent such that the pixel _centers_
-            fall on  zero-based row, column indices is used.
+            The location, in data-coordinates, of the lower-left and upper-right
+            corners of the image.  If `None`, the image is positioned such that
+            the pixel centers fall on zero-based (row, column) indices.
 
         shape : scalars (columns, rows), optional, default: None
             For raw buffer images
