diff --git a/.gitmodules b/.gitmodules
index b56a8c9..c5f0597 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "vim/bundle/vim-devicons"]
 	path = vim/bundle/vim-devicons
 	url = git@github.com:ryanoasis/vim-devicons.git
+[submodule "vim/bundle/nerdtree-git-plugin"]
+	path = vim/bundle/nerdtree-git-plugin
+	url = git@github.com:Xuyuanp/nerdtree-git-plugin.git
diff --git a/vim/bundle/vim-airline b/vim/bundle/vim-airline
deleted file mode 160000
index 1d8408a..0000000
--- a/vim/bundle/vim-airline
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 1d8408a7f85d1fb4c4bbf519d7833b1872fdc14c