diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,15 +1,82 @@
 # [acme-dns-01-namecheap](https://git.rootprojects.org/root/acme-dns-01-namecheap) | a [Root](https://rootrpojects.org) project
 
-NameCheap DNS for Let's Encrypt / ACME dns-01 challenges with ACME.js and Greenlock.js (Node.js).
+NameCheap DNS + Let's Encrypt 
 
 
-# In Development
-The documentation for how to pass the tests is here:
+This handles ACME dns-01 challenges, compatible with ACME.js and Greenlock.js.
+Passes [acme-dns-01-test](https://git.rootprojects.org/root/acme-dns-01-test.js).
+
+# Install
+
+```bash
+npm install --save acme-dns-01-namecheap@3.x
+```
+
+# Usage
+
+First you create an instance with your credentials:
+
+```js
+var dns01 = require('acme-dns-01-namecheap').create({
+    apiUser:'username',
+    apiKey : 'xxxx',
+    clientIp:'public ip',
+    username: 'api user',
+	baseUrl: 'sandbox or production', // default production
+});
+```
+
+Then you can use it with any compatible ACME module,
+such as Greenlock.js or ACME.js.
+
+### Greenlock.js
+
+```js
+var Greenlock = require('greenlock-express');
+var greenlock = Greenlock.create({
+	challenges: {
+		'dns-01': dns01
+		// ...
+	}
+});
+```
+
+See [Greenlock™ Express](https://git.rootprojects.org/root/greenlock-express.js)
+and/or [Greenlock.js](https://git.rootprojects.org/root/greenlock.js) documentation for more details.
+
+### ACME.js
+
+```js
+// TODO
+```
+
+See the [ACME.js](https://git.rootprojects.org/root/acme-v2.js) for more details.
+
+### Build your own
+
+```js
+dns01
+  .set({
+    identifier: { value: 'foo.example.com' },
+    wildcard: false,
+    dnsHost: '_acme-challenge.foo.example.com',
+    dnsAuthorization: 'xxx_secret_xxx'
+  })
+  .then(function () {
+    console.log("TXT record set");
+  })
+  .catch(function () {
+    console.log("Failed to set TXT record");
+  });
+```
+
+See [acme-dns-01-test](https://git.rootprojects.org/root/acme-dns-01-test.js)
+for more implementation details.
 
-* https://git.rootprojects.org/root/acme-dns-01-test.js
 # Tests
 
-```
-# node ./test.js domain-zone api-user api-key username [username is optional if similar to api-user]
-node ./test.js example.com demo d41474b94e7d4536baabb074a09c96bd
+```bash
+# node ./test.js domain-zone api-user api-key client-ip username [username is optional if similar to api-user]
+node ./test.js example.com demo 45.77.4.126 d41474b94e7d4536baabb074a09c96bd
+
 ```