diff --git a/README.md b/README.md
index fad48f9..2d48000 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,22 @@ Electrum Protocol Client for Node.js
 npm i electrum-client
 ```
 
-## spec
+## usage
 
-* ○ TCP stratum
-* x SSL stratum
-* ○ subscribe
+```
+const ElectrumCli = require('electrum-client')
+const main = async () => {
+    const ecl = new ElectrumCli(995, 'btc.smsys.me', 'tls') // tcp or tls
+    await ecl.connect() // connect(promise)
+    ecl.subscribe.on('blockchain.headers.subscribe', (v) => console.log(v)) // subscribe message(EventEmitter)
+    try{
+        const ver = await ecl.server_version("2.7.11", "1.0") // json-rpc(promise)
+        console.log(ver)
+    }catch(e){
+        console.log(e)
+    }
+    await ecl.close() // disconnect(promise)
+}
+main()
+```
 
diff --git a/example/simple.js b/example/simple.js
new file mode 100644
index 0000000..b674e3a
--- /dev/null
+++ b/example/simple.js
@@ -0,0 +1,14 @@
+const ElectrumCli = require('..')
+
+const main = async () => {
+    const ecl = new ElectrumCli(995, 'btc.smsys.me', 'tls')
+    await ecl.connect()
+    try{
+        const ver = await ecl.server_version("2.7.11", "1.0")
+        console.log(ver)
+    }catch(e){
+        console.log(e)
+    }
+    await ecl.close()
+}
+main()