diff --git a/01_ai_agents_first/13_agents_as_tool/README.md b/01_ai_agents_first/13_agents_as_tool/README.md
index 999f4b27..51447ae0 100644
--- a/01_ai_agents_first/13_agents_as_tool/README.md
+++ b/01_ai_agents_first/13_agents_as_tool/README.md
@@ -142,9 +142,9 @@ weather_agent:Agent = Agent(
 
 
 @function_tool
-def weather_agent_fun(query: str) -> str:
+async def weather_agent_fun(query: str) -> str:
 
-  result:Runner = Runner.run_sync(weather_agent, query)
+  result= await Runner.run(weather_agent, query)
   return result.final_output
 
 
@@ -253,4 +253,4 @@ If later you need stricter control, replace a tool with a `@function_tool` that
 - **✅ When to use**: Short, focused subtasks—translate, extract, format—while preserving one conversational owner.
 - **🔨 How to do it**: Start with `agent.as_tool(...)`; switch to a function tool that calls `Runner.run(...)` when you need more control.
 
-If you want, I can turn this into a printable cheat-sheet or a small lab with checkpoints and expected outputs.
\ No newline at end of file
+If you want, I can turn this into a printable cheat-sheet or a small lab with checkpoints and expected outputs.