diff --git a/doc/conf.py.in b/doc/conf.py.in
index 2580d8c9..aadfeac8 100644
--- a/doc/conf.py.in
+++ b/doc/conf.py.in
@@ -95,6 +95,7 @@ html_sidebars = {'index': ['sideb.html', 'searchbox.html']}
 htmlhelp_basename = '@PROJECT_NAME@doc'
 
 # Plot options
+plot_include_source = True
 plot_html_show_source_link = False
 plot_html_show_formats = False