diff --git a/.gitmodules b/.gitmodules
index e69de29..9b1e72e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "sdb"]
+	path = sdb
+	url = https://github.com/mono/sdb
diff --git a/sdb b/sdb
new file mode 160000
index 0000000..61e0e3b
--- /dev/null
+++ b/sdb
@@ -0,0 +1 @@
+Subproject commit 61e0e3bef24c167141c5214d570646e7b27ae532