diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..1842f41
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "pkg/libsignalgo/libsignal"]
+	path = pkg/libsignalgo/libsignal
+	url = https://github.com/signalapp/libsignal.git
diff --git a/pkg/libsignalgo/libsignal b/pkg/libsignalgo/libsignal
new file mode 160000
index 0000000..af7bb85
--- /dev/null
+++ b/pkg/libsignalgo/libsignal
@@ -0,0 +1 @@
+Subproject commit af7bb8567c812aa13625fc90076bf71a59d64ff5