diff --git a/python/README.md b/python/README.md
index 805d005..aaa1d6f 100644
--- a/python/README.md
+++ b/python/README.md
@@ -43,7 +43,7 @@ credentials = {
 }
 
 configuration_name = 'cos_config_string'  #you can give any string you like
-cos = ibmos2spark.CloudObjectStorage(sc, credentials, configuration_name)  #sc is the SparkContext instance.
+cos = ibmos2spark.CloudObjectStorage(sparkcontext=sc, credentials=credentials, configuration_name=configuration_name)  #sc is the SparkContext instance.
 
 bucket_name = 'some_bucket_name'
 object_name = 'file1'