diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..01764e3
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "bottom"]
+	path = bottom
+	url = https://github.com/ClementTsang/bottom
diff --git a/bottom b/bottom
new file mode 160000
index 0000000..9d6d712
--- /dev/null
+++ b/bottom
@@ -0,0 +1 @@
+Subproject commit 9d6d712e27fa6b90f505e214bd039865e63214e5