diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..ae42512
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lilypond-hd"]
+	path = lilypond-hd
+	url = https://git.dijkewijk.nl/hans/lilypond-hd.git
diff --git a/lilypond-hd b/lilypond-hd
new file mode 160000
index 0000000..3ccd2aa
--- /dev/null
+++ b/lilypond-hd
@@ -0,0 +1 @@
+Subproject commit 3ccd2aa9f754a426badfbf96bb0a7adecf3976cd