From 2f9f3019a15bb25d6f91b0d198e60c0f6c00d35e Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Mon, 20 May 2019 19:20:31 -0400
Subject: [PATCH] DOC: add note to example about keeping hard-ref to
 SpanSelector

closes #14276
---
 examples/widgets/span_selector.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/examples/widgets/span_selector.py b/examples/widgets/span_selector.py
index e3516b0ef7de..c98b6640e929 100644
--- a/examples/widgets/span_selector.py
+++ b/examples/widgets/span_selector.py
@@ -38,9 +38,17 @@ def onselect(xmin, xmax):
     ax2.set_ylim(thisy.min(), thisy.max())
     fig.canvas.draw()
 
-# Set useblit=True on most backends for enhanced performance.
+#############################################################################
+# .. note
+#
+#    If the SpanSelector object is garbage collected you will lose the
+#    interactivity.  You must keep a hard reference to it to prevent this.
+#
+
+
 span = SpanSelector(ax1, onselect, 'horizontal', useblit=True,
                     rectprops=dict(alpha=0.5, facecolor='red'))
+# Set useblit=True on most backends for enhanced performance.
 
 
 plt.show()