diff --git a/tools/codegen/core/gen_load_balancing_proto.sh b/tools/codegen/core/gen_load_balancing_proto.sh
index 6d974ce31b9a6b7361c6c25203d08e37ad3cfbb4..fb6a468ee0b68d376919750427e89f5f46b23ffb 100755
--- a/tools/codegen/core/gen_load_balancing_proto.sh
+++ b/tools/codegen/core/gen_load_balancing_proto.sh
@@ -110,6 +110,8 @@ virtualenv $VENV_NAME
 . $VENV_NAME/bin/activate
 popd
 
+# this should be the same version as the submodule we compile against
+# ideally we'd update this as a template to ensure that
 pip install protobuf==3.0.0b2
 
 pushd "$(dirname $1)" > /dev/null