diff --git a/docs/advanced.rst b/docs/advanced.rst
index f3eb68c1..965b02b7 100644
--- a/docs/advanced.rst
+++ b/docs/advanced.rst
@@ -189,7 +189,7 @@ of post data parameters to filter.
 .. code:: python
 
     with my_vcr.use_cassette('test.yml', filter_post_data_parameters=['client_secret']):
-        requests.post('http://api.com/postdata', data={'api_key': 'secretstring'})
+        requests.post('http://api.com/postdata', data={'client_secret': 'secretstring'})
 
 Advanced use of filter_headers, filter_query_parameters and filter_post_data_parameters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~