diff --git a/demo_docs/source/conf.py b/demo_docs/source/conf.py
index 0c059188..ac160a14 100644
--- a/demo_docs/source/conf.py
+++ b/demo_docs/source/conf.py
@@ -29,8 +29,9 @@ sys.path.append(os.path.abspath('./test_py_module'))
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = [
-	'sphinx.ext.autodoc',
-	'sphinx.ext.mathjax',
+    'sphinx.ext.autodoc',
+    'sphinx.ext.mathjax',
+    'sphinx.ext.viewcode',
 ]
 
 # Math
@@ -156,7 +157,7 @@ html_theme_path = ["../.."]
 #html_split_index = False
 
 # If true, links to the reST sources are added to the pages.
-#html_show_sourcelink = True
+html_show_sourcelink = True
 
 # If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
 #html_show_sphinx = True