diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index a19fc92d..5508cf96 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -42,6 +42,7 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
+    'oslosphinx',
     'reno.sphinxext',
 ]
 # Add any paths that contain templates here, relative to this directory.