diff --git a/docs/conf.py b/docs/conf.py
index 80a0cda..17f728b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -34,6 +34,7 @@
 extensions = [
     'sphinx.ext.autodoc',
     'sphinx.ext.autodoc.typehints',
+    'sphinx.ext.viewcode',
     'myst_parser',
     'sphinx.ext.napoleon',
 ]