diff --git a/docs/Nvim_setup.sh b/docs/Nvim_setup.sh
index b76b7c0..017e7de 100755
--- a/docs/Nvim_setup.sh
+++ b/docs/Nvim_setup.sh
@@ -91,6 +91,7 @@ fi
 #######################################################################
 NODE_DIR=$HOME/tools/nodejs
 NODE_SRC_NAME=$HOME/packages/nodejs.tar.gz
+# when download speed is slow, we can also use its mirror site: https://mirrors.ustc.edu.cn/node/v15.0.0/
 NODE_LINK="https://nodejs.org/dist/v14.15.4/node-v14.15.4-linux-x64.tar.xz"
 
 mkdir -p $HOME/tools