diff --git a/docs/source/conf.py b/docs/source/conf.py
index 673128efa9e14de1d9091624975b651fdc2a0736..cdc7c648e5f2e92ab089e0392f4cdccd563c585f 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -23,7 +23,8 @@ extensions = [
     'sphinx.ext.autosummary',
     'sphinx.ext.intersphinx',
     'sphinx.ext.napoleon',
-    'nbsphinx'
+    'nbsphinx',
+    'sphinx_rtd_theme',
 ]
 
 autodoc_mock_imports = ['numpy','scipy','xarray','pandas','netCDF4','osselyze','osselyze.utils']