diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d8dc293
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "external/Catch2"]
+	path = external/Catch2
+	url = https://github.com/catchorg/Catch2
diff --git a/external/Catch2 b/external/Catch2
new file mode 160000
index 0000000..dbbab87
--- /dev/null
+++ b/external/Catch2
@@ -0,0 +1 @@
+Subproject commit dbbab8727c342733f75045483048cdcb52421e32