diff --git a/docs/api-usage.rst b/docs/api-usage.rst
index 4c57c29c3..ede2d4785 100644
--- a/docs/api-usage.rst
+++ b/docs/api-usage.rst
@@ -283,7 +283,7 @@ The following sample illustrates how to use a client-side certificate:
    import requests
 
    session = requests.Session()
-   s.cert = ('/path/to/client.cert', '/path/to/client.key')
+   session.cert = ('/path/to/client.cert', '/path/to/client.key')
    gl = gitlab.gitlab(url, token, api_version=4, session=session)
 
 Reference: