diff --git a/tools/jenkins/grpc_interop_go/build_interop.sh b/tools/jenkins/grpc_interop_go/build_interop.sh
index c8c5eafd4815141e80123ee35f6a4b298c0d2f12..78dd4ea9cf5eb8495a4e53835598a0953d0a3559 100755
--- a/tools/jenkins/grpc_interop_go/build_interop.sh
+++ b/tools/jenkins/grpc_interop_go/build_interop.sh
@@ -37,6 +37,8 @@ set -e
 git clone --recursive /var/local/jenkins/grpc-go src/gooogle.golang.org/grpc
 
 # Get dependencies from GitHub
+# NOTE: once grpc-go dependencies change, this needs to be updated manually
+# but we don't expect this to happen any time soon.
 go get github.com/golang/protobuf/proto
 go get golang.org/x/net/context
 go get golang.org/x/net/trace