diff --git a/doc/examples/plot_hough_transform.py b/doc/examples/plot_hough_transform.py
index 985d97ec..e19c37d7 100644
--- a/doc/examples/plot_hough_transform.py
+++ b/doc/examples/plot_hough_transform.py
@@ -1,7 +1,7 @@
 """
-===============
-Hough transform
-===============
+=============================
+Straight line Hough transform
+=============================
 
 The Hough transform in its simplest form is a `method to detect straight lines
 <http://en.wikipedia.org/wiki/Hough_transform>`__.