diff --git a/sagemaker-core/tests/integ/s3_utils.py b/sagemaker-core/tests/integ/s3_utils.py
index 1ea6a4b4dc..3e063a3f14 100644
--- a/sagemaker-core/tests/integ/s3_utils.py
+++ b/sagemaker-core/tests/integ/s3_utils.py
@@ -58,3 +58,4 @@ def extract_files_from_s3(s3_url, tmpdir, sagemaker_session):
 
     with tarfile.open(model, "r") as tar_file:
         custom_extractall_tarfile(tar_file, tmpdir)
+# Test-only change to verify PR-check submodule selection (no behavior change).
diff --git a/sagemaker-serve/src/sagemaker/serve/configs.py b/sagemaker-serve/src/sagemaker/serve/configs.py
index 4951699545..c832aa834d 100644
--- a/sagemaker-serve/src/sagemaker/serve/configs.py
+++ b/sagemaker-serve/src/sagemaker/serve/configs.py
@@ -31,4 +31,5 @@ class Network:
 class Compute:
     """Compute configuration for model deployment."""
     instance_type: Optional[str]
-    instance_count: Optional[int] = 1
\ No newline at end of file
+    instance_count: Optional[int] = 1
+# Source change to verify PR-check submodule selection (no behavior change).