diff --git a/package.json b/package.json
index 597c99f..10e28d3 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
         "captcha"
     ],
     "main": "index.js",
+    "types": "types/index.d.ts",
     "scripts": {
         "lint": "standard | snazzy",
         "lint:fix": "standard --fix",
@@ -33,6 +34,7 @@
         "standard": "^17.1.0",
         "tap": "^18.4.0",
         "ts-standard": "^12.0.2",
+        "tsd": "^0.29.0"
     },
     "dependencies": {
         "fastify-plugin": "^4.5.1"
diff --git a/types/index.d.ts b/types/index.d.ts
new file mode 100644
index 0000000..7b1f853
--- /dev/null
+++ b/types/index.d.ts
@@ -0,0 +1,42 @@
+import {
+    FastifyPluginCallback,
+} from 'fastify';
+
+declare module 'fastify' {
+    interface FastifyContextConfig {
+        cfTurnstile?: fastifyCfTurnstile.FastifyCfTurnstileOptions;
+    }
+}
+
+type FastifyCfTurnstile = FastifyPluginCallback<fastifyCfTurnstile.FastifyCfTurnstileOptions>;
+
+/**
+* Namespace for fastify-cf-turnstile plugin options.
+*
+* @namespace fastifyCfTurnstile
+*/
+declare namespace fastifyCfTurnstile {
+    /**
+     * Options for configuring the fastify-cf-turnstile plugin.
+     *
+     * @interface FastifyCfTurnstileOptions
+     */
+    export interface FastifyCfTurnstileOptions {
+        /**
+         * CloudFlare Turnstile sitekey
+         * @type {string}
+         */
+        sitekey: string
+
+        /**
+         * CloudFlare Turnstile privatekey
+         * @type {string}
+         */
+        privatekey: string
+    }
+    export const fastifyCfTurnstile: FastifyCfTurnstile
+    export { fastifyCfTurnstile as default }
+}
+
+declare function fastifyCfTurnstile(...params: Parameters<FastifyCfTurnstile>): ReturnType<FastifyCfTurnstile>
+export = fastifyCfTurnstile
\ No newline at end of file
diff --git a/types/index.test-d.ts b/types/index.test-d.ts
new file mode 100644
index 0000000..6a252e3
--- /dev/null
+++ b/types/index.test-d.ts
@@ -0,0 +1,20 @@
+import fastify, {
+    FastifyInstance,
+} from 'fastify';
+import { expectError, expectAssignable } from 'tsd';
+import { FastifyCfTurnstileOptions, default as plugin } from '.';
+
+const app: FastifyInstance = fastify();
+
+const fastifyCfTurnstileOptions = {
+    sitekey: 'test',
+    privatekey: 'test'
+}
+
+app.register(plugin, {
+    sitekey: 'test',
+    privatekey: 'test'
+})
+expectError(app.register(plugin, {}))
+
+expectAssignable<FastifyCfTurnstileOptions>(fastifyCfTurnstileOptions)