diff --git a/docs/source/conf.py b/docs/source/conf.py
index 5b391736872ff44b51ba732ae22987457c137d2b..cc478dd62b91dff3c0276b236de6a6a0fd9d448e 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -22,7 +22,7 @@ extensions = [
     'sphinx.ext.autosummary',
     'sphinx.ext.intersphinx',
     'sphinx.ext.napoleon',
-    'nbsphinx',,
+    'nbsphinx',
 ]
 
 autodoc_mock_imports = ['numpy','scipy','xarray','pandas','netCDF4','osselyze','osselyze.utils']