diff --git a/.gitmodules b/.gitmodules
index 3a2744ed..49e6a0a6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -54,3 +54,6 @@
 	path = web/documentserver-example/csharp/assets/document-templates
 	url = https://github.com/ONLYOFFICE/document-templates
 	branch = main/en
+[submodule "web/documentserver-example/csharp/assets/document-formats"]
+	path = web/documentserver-example/csharp/assets/document-formats
+	url = https://github.com/ONLYOFFICE/document-formats
diff --git a/web/documentserver-example/csharp/assets/document-formats b/web/documentserver-example/csharp/assets/document-formats
new file mode 160000
index 00000000..bf21acc7
--- /dev/null
+++ b/web/documentserver-example/csharp/assets/document-formats
@@ -0,0 +1 @@
+Subproject commit bf21acc7666b9ddb64606247f5afb119952f8475