diff --git a/doc/source/user_guide/numpy_images.rst b/doc/source/user_guide/numpy_images.rst
index 13727161..d16a5d5b 100644
--- a/doc/source/user_guide/numpy_images.rst
+++ b/doc/source/user_guide/numpy_images.rst
@@ -1,5 +1,6 @@
+==================================
 A crash course on NumPy for images
-----------------------------------
+==================================
 
 Images manipulated by ``scikit-image`` are simply NumPy arrays. Hence, a
 large fraction of operations on images will just consist in using NumPy::