diff --git a/README.md b/README.md
new file mode 100644
index 0000000..fa4aee3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# C++ to Swift interop
+
+This is a C++ backend which is callable from Swift code. It is also possible to do bidirectional C++ to Swift, see https://github.com/apple/swift-cmake-examples/tree/main/3_bidirectional_cxx_interop