diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..95b53c2e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "externals/asio"]
+	path = externals/asio
+	url = https://github.com/chriskohlhoff/asio.git
diff --git a/externals/asio b/externals/asio
new file mode 160000
index 00000000..c466dc46
--- /dev/null
+++ b/externals/asio
@@ -0,0 +1 @@
+Subproject commit c466dc46d55755d38ee1831e95207d6b329c4976