diff --git a/skimage/viewer/canvastools/recttool.py b/skimage/viewer/canvastools/recttool.py
index 595faba6..93400ceb 100644
--- a/skimage/viewer/canvastools/recttool.py
+++ b/skimage/viewer/canvastools/recttool.py
@@ -39,7 +39,7 @@ class RectangleTool(CanvasToolBase, RectangleSelector):
         Rectangle extents: (xmin, xmax, ymin, ymax).
     
 
-     Examples
+    Examples
     --------
     >>> from skimage import data
     >>> import matplotlib.pyplot as plt
@@ -52,21 +52,21 @@ class RectangleTool(CanvasToolBase, RectangleSelector):
     >>> [f, ax] = plt.subplots()
     >>> ax.imshow(im)
 
-    >>> def stampa(extents):
-    >>>     global im,ax
-    >>>     coord = np.int64(extents)
-    >>>     [rr1, cc1] = line(coord[2],coord[0],coord[2],coord[1])
-    >>>     [rr2, cc2] = line(coord[2],coord[1],coord[3],coord[1])
-    >>>     [rr3, cc3] = line(coord[3],coord[1],coord[3],coord[0])
-    >>>     [rr4, cc4] = line(coord[3],coord[0],coord[2],coord[0])
-    >>>     set_color(im, (rr1, cc1), [255, 255, 0])
-    >>>     set_color(im, (rr2, cc2), [0, 255, 255])
-    >>>     set_color(im, (rr3, cc3), [255, 0, 255])
-    >>>     set_color(im, (rr4, cc4), [0, 0, 0])
-    >>>     ax.imshow(im)
-    >>>     plt.show()
+    >>> def print_the_rect(extents):
+            global im,ax
+            coord = np.int64(extents)
+            [rr1, cc1] = line(coord[2],coord[0],coord[2],coord[1])
+            [rr2, cc2] = line(coord[2],coord[1],coord[3],coord[1])
+            [rr3, cc3] = line(coord[3],coord[1],coord[3],coord[0])
+            [rr4, cc4] = line(coord[3],coord[0],coord[2],coord[0])
+            set_color(im, (rr1, cc1), [255, 255, 0])
+            set_color(im, (rr2, cc2), [0, 255, 255])
+            set_color(im, (rr3, cc3), [255, 0, 255])
+            set_color(im, (rr4, cc4), [0, 0, 0])
+            ax.imshow(im)
+            plt.show()
 
-    >>> rect_tool = RectangleTool(ax, on_enter=stampa)
+    >>> rect_tool = RectangleTool(ax, on_enter=print_the_rect)
     >>> plt.show()
  
     """