diff --git a/contributing/samples/simple_sequential_agent/agent.py b/contributing/samples/simple_sequential_agent/agent.py
index 9ec0b35..4774336 100644
--- a/contributing/samples/simple_sequential_agent/agent.py
+++ b/contributing/samples/simple_sequential_agent/agent.py
@@ -66,6 +66,7 @@ def check_prime(nums: list[int]) -> str:
   )
 
 
+# --- Check Prime Sub-Agent ---
 prime_agent = LlmAgent(
     name="prime_agent",
     description="Handles checking if numbers are prime.",