diff --git a/examples/on-chain_mnist/action_agent.py b/examples/on-chain_mnist/action_agent.py
index 3788a3f..aa00fc1 100644
--- a/examples/on-chain_mnist/action_agent.py
+++ b/examples/on-chain_mnist/action_agent.py
@@ -108,6 +108,7 @@ def execution():
     agent = GizaAgent(model)
     agent.infer(img_path)
     receipt = verify_and_transmit(agent, accounts[0])
+    # call serve
     return receipt
 
 if __name__ == '__main__':