diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..88665bd
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,4 @@
+
+export function parse(source: string): string[];
+export function parse<T>(source: string, transform: (value: string) => T): T[];
+
diff --git a/package.json b/package.json
index a509f96..ce54285 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
   "scripts": {
     "test": "standard && tape test.js"
   },
+  "types": "index.d.ts",
   "keywords": [
     "postgres",
     "array",
@@ -29,6 +30,7 @@
   },
   "files": [
     "index.js",
+    "index.d.ts",
     "readme.md"
   ]
 }