diff --git a/src/tunnel.ts b/src/tunnel.ts
index 8478a13..0d9c7a7 100644
--- a/src/tunnel.ts
+++ b/src/tunnel.ts
@@ -2,19 +2,74 @@ import { existsSync } from "node:fs";
 import consola from "consola";
 
 export interface TunnelOptions {
+  /**
+   * The URL to which the tunnel should connect. The default is to construct a URL based on protocol, hostname and port.
+   * @optional
+   */
   url?: string;
+
+  /**
+   * The port number to use for the tunnel connection. Can be a string or a number. Defaults to 3000.
+   * @optional
+   */
   port?: number | string;
+
+  /**
+   * The host name for the tunnel connection. Defaults to localhost.
+   * @optional
+   */
   hostname?: string;
+
+  /**
+   * The protocol to use for the tunnel connection, either "http" or "https". Default is http.
+   * @optional
+   */
   protocol?: "http" | "https";
+
+  /**
+   * Specifies whether to enforce TLS verification. Default is true.
+   * @optional
+   */
   verifyTLS?: boolean;
+
+  /**
+   * Indicates whether the user accepts the Cloudflare Terms of Service for using cloudflared. Default is false.
+   * @optional
+   */
   acceptCloudflareNotice?: boolean;
 }
 
 export interface Tunnel {
+  /**
+   * Get the current URL of the active tunnel.
+   * @returns {Promise<string>} A promise that resolves to the URL of the tunnel.
+   */
   getURL: () => Promise<string>;
+
+  /**
+   * Close the active tunnel.
+   * @returns {Promise<void>} A promise that will be resolved when the tunnel is successfully closed.
+   */
   close: () => Promise<void>;
 }
 
+/**
+ * Initialises and starts a network tunnel using cloudflared.
+ * @param {TunnelOptions} opts - Configuration options for the tunnel.
+ * @returns {Promise<undefined | Tunnel>} A promise that resolves to the tunnel instance, or undefined if the setup fails.
+ * @throws {Error} If there are problems installing cloudflared or starting the tunnel.
+ * @example
+ * const tunnelOptions = {
+ *  protocol: "https",
+ *  port: "443",
+ *  hostname: "example.com",
+ *  verifyTLS: true
+ *  acceptCloudflareNotice: true
+ * };
+ * const tunnel = await startTunnel(tunnelOptions);
+ * console.log(await tunnel.getURL());
+ * await tunnel.close();
+ */
 export async function startTunnel(
   opts: TunnelOptions,
 ): Promise<undefined | Tunnel> {