diff --git a/python/ray/worker.py b/python/ray/worker.py
index 0395e61d7..8cab2bd89 100644
--- a/python/ray/worker.py
+++ b/python/ray/worker.py
@@ -611,7 +611,7 @@ def init(
             development, and the API is subject to change.
         _object_spilling_config (str): The configuration json string for object
             spilling I/O worker.
-        _system_config (str): JSON configuration for overriding
+        _system_config (dict): Configuration for overriding
             RayConfig defaults. For testing purposes ONLY.
 
     Returns: