diff --git a/.gitmodules b/.gitmodules
index baedc10..8b6911c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -44,6 +44,9 @@
 [submodule "packed"]
 	path = lib/packed
 	url = git@github.com:emacscollective/packed.git
+[submodule "treepy"]
+	path = lib/treepy
+	url = git@github.com:volrath/treepy.el.git
 [submodule "use-package"]
 	path = lib/use-package
 	url = git@github.com:jwiegley/use-package.git
diff --git a/lib/treepy b/lib/treepy
new file mode 160000
index 0000000..b40e6b0
--- /dev/null
+++ b/lib/treepy
@@ -0,0 +1 @@
+Subproject commit b40e6b09eb9be45da67b8c9e4990a5a0d7a2a09d