diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000000000000000000000000000000000..2da4ffaff6f14c5030e526a99a032102ef20a25f
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "3rdparty/libmdbx"]
+	path = 3rdparty/libmdbx
+	url = https://gitflic.ru/project/erthink/libmdbx.git
+