diff --git a/examples/foundational/20e-persistent-context-aws-nova-sonic.py b/examples/foundational/20e-persistent-context-aws-nova-sonic.py
index 8a95f54b9..731c69c3a 100644
--- a/examples/foundational/20e-persistent-context-aws-nova-sonic.py
+++ b/examples/foundational/20e-persistent-context-aws-nova-sonic.py
@@ -185,7 +185,7 @@ async def run_bot(webrtc_connection: SmallWebRTCConnection):
     llm = AWSNovaSonicLLMService(
         secret_access_key=os.getenv("AWS_SECRET_ACCESS_KEY"),
         access_key_id=os.getenv("AWS_ACCESS_KEY_ID"),
-        region=os.getenv("AWS_REGION"),
+        region=os.getenv("AWS_REGION"),  # as of 2025-05-06, us-east-1 is the only supported region
         voice_id="tiffany",  # matthew, tiffany, amy
         # you could choose to pass instruction here rather than via context
         # system_instruction=system_instruction,
diff --git a/examples/foundational/39-aws-nova-sonic.py b/examples/foundational/39-aws-nova-sonic.py
index c80626962..a89796ea6 100644
--- a/examples/foundational/39-aws-nova-sonic.py
+++ b/examples/foundational/39-aws-nova-sonic.py
@@ -99,7 +99,7 @@ async def run_bot(webrtc_connection: SmallWebRTCConnection):
     llm = AWSNovaSonicLLMService(
         secret_access_key=os.getenv("AWS_SECRET_ACCESS_KEY"),
         access_key_id=os.getenv("AWS_ACCESS_KEY_ID"),
-        region=os.getenv("AWS_REGION"),
+        region=os.getenv("AWS_REGION"),  # as of 2025-05-06, us-east-1 is the only supported region
         voice_id="tiffany",  # matthew, tiffany, amy
         # you could choose to pass instruction here rather than via context
         # system_instruction=system_instruction