diff --git a/docs/design/plugin_system.md b/docs/design/plugin_system.md
index f8fb09924..22aae54ed 100644
--- a/docs/design/plugin_system.md
+++ b/docs/design/plugin_system.md
@@ -24,7 +24,7 @@ vLLM's plugin system uses the standard Python `entry_points` mechanism. This mec
             ["register_dummy_model = vllm_add_dummy_model:register"]
         })
 
-    # inside `vllm_add_dummy_model.py` file
+    # inside `vllm_add_dummy_model/__init__.py` file
     def register():
         from vllm import ModelRegistry