diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 00000000..55637511
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,14 @@
+export function parse(connectionString: string): ConnectionOptions;
+
+export interface ConnectionOptions {
+  host: string | null;
+  password: string | null;
+  user: string | null;
+  port: number | null;
+  database: string | null;
+  client_encoding: string | null;
+  ssl: boolean | null;
+
+  application_name: string | null;
+  fallback_application_name: string | null;
+}
diff --git a/package.json b/package.json
index c6d4512d..f3b14c90 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,8 @@
   "name": "pg-connection-string",
   "version": "0.1.3",
   "description": "Functions for dealing with a PostgresSQL connection string",
-  "main": "index.js",
+  "main": "./index.js",
+  "types": "./index.d.ts",
   "scripts": {
     "test": "tap ./test"
   },