diff --git a/gin/config.py b/gin/config.py
index d569e08..3080f9e 100644
--- a/gin/config.py
+++ b/gin/config.py
@@ -1196,7 +1196,7 @@ def some_configurable_function(param1, param2='a default value'):
   The decorator can be supplied with parameters to specify the configurable name
   or supply a whitelist/blacklist:
 
-      @config.configurable('explicit_configurable_name', whitelist='param2')
+      @config.configurable('explicit_configurable_name', whitelist=['param2'])
       def some_configurable_function(param1, param2='a default value'):
         ...