diff --git a/conda/build_docker.sh b/conda/build_docker.sh
index db7c5be62..720211250 100755
--- a/conda/build_docker.sh
+++ b/conda/build_docker.sh
@@ -11,6 +11,7 @@ if [[ ${CUDA_VERSION:0:2} == "10" ]]; then
   DEVTOOLSET_VERSION="7"
 fi
 
+# add a empty line
 case ${CUDA_VERSION} in
   cpu)
     BASE_TARGET=base