diff --git a/.gitignore b/.gitignore
index aeed55a..1bd074b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,6 @@ result-*
 
 # Rust
 **/target
+
+# Other
+nixops4-bindings-sys
diff --git a/docs/ref.md b/docs/ref.md
new file mode 100644
index 0000000..db53d00
--- /dev/null
+++ b/docs/ref.md
@@ -0,0 +1,3 @@
+# Nix Bindgen-rs References
+- https://github.com/NotAShelf/nix-bindings
+- https://github.com/nixops4/nix-bindings-rust