diff --git a/README.md b/README.md
index 76c0d60d9..84a81d081 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,7 @@ from agents import Agent, Runner, function_tool
 
 @function_tool
 def get_weather(city: str) -> str:
+    """Get the current weather for a given city."""
     return f"The weather in {city} is sunny."