diff --git a/content/v1.16/guides/write-a-composition-function-in-python.md b/content/v1.16/guides/write-a-composition-function-in-python.md
index ea030f01..ee33a5e1 100644
--- a/content/v1.16/guides/write-a-composition-function-in-python.md
+++ b/content/v1.16/guides/write-a-composition-function-in-python.md
@@ -562,7 +562,7 @@ hatch run development
 ```
 
 {{<hint "warning">}}
-`hatch run development` runs the function without encryption or authentication.
+`hatch run development` runs the function, and listen to incoming grpc request on port 9443 without encryption or authentication.
 Only use it during testing and development.
 {{</hint>}}