diff --git a/.gitmodules b/.gitmodules
index 8c99c45..3ccb293 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "docs/reference/outline-openapi"]
 	path = docs/reference/outline-openapi
 	url = https://github.com/outline/openapi.git
+[submodule "Vendor/swift-markdown-engine"]
+	path = Vendor/swift-markdown-engine
+	url = https://github.com/nodes-app/swift-markdown-engine.git
diff --git a/Vendor/swift-markdown-engine b/Vendor/swift-markdown-engine
new file mode 160000
index 0000000..e5f7607
--- /dev/null
+++ b/Vendor/swift-markdown-engine
@@ -0,0 +1 @@
+Subproject commit e5f7607fc4021181056ef7a09dbb7573dc0237d9