diff --git a/examples/widgets/span_selector.py b/examples/widgets/span_selector.py
index c98b6640e929..2e720f4c98a8 100644
--- a/examples/widgets/span_selector.py
+++ b/examples/widgets/span_selector.py
@@ -39,7 +39,7 @@ def onselect(xmin, xmax):
     fig.canvas.draw()
 
 #############################################################################
-# .. note
+# .. note::
 #
 #    If the SpanSelector object is garbage collected you will lose the
 #    interactivity.  You must keep a hard reference to it to prevent this.