diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..3d15946
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "cpp-lib"]
+	path = cpp-lib
+	url = https://github.com/ZeroStorageCaptcha/cpp-lib
diff --git a/cpp-lib b/cpp-lib
new file mode 160000
index 0000000..da61a7b
--- /dev/null
+++ b/cpp-lib
@@ -0,0 +1 @@
+Subproject commit da61a7b3ec03da25f4e5965428de851ce702975c