diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index 2d87f2a52..31127a71d 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -26,7 +26,8 @@ from watcher import version as watcher_version
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ['reno.sphinxext']
+extensions = ['reno.sphinxext',
+              'oslosphinx']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']