diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c1c871c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,89 @@
+# Go-Tezos-Keygen
+
+## Usage
+```
+Usage of ./go-tezos-keygen:
+  -a string
+    	Address (default ":3000")
+  -d string
+    	Database
+  -l string
+    	Level (default "info")
+  -n string
+    	Networks configuration file
+  -seed
+    	Generate seed and exit
+```
+
+Example:
+```sh
+./go-tezos-keygen -d db.db -n networks.yaml -l debug
+```
+
+## Networks file
+The networks configuration file uses YAML syntax. Example:
+```yaml
+testnet:
+  url: https://nairobinet.ecadinfra.com
+  chain-id: NetXyuzvDo2Ugzb
+  seed: f7353829d316c20922f8ff2ed696090801d9c775977df6423cd68a737c628b844b13c951de7cb7cd01cd62430edeefbc219885b388f06cb5d1e496f63bc9c0d5
+  private-key: edsk2mgqWz5tUQQPK2LCg4Ae2G9bdd8RGzJP9oR3S7cKgASndbnRjE
+  min-balance: 100000
+  amount: 2000000
+  ops-per-group: 5
+  lease-time: 1m
+  buffer-length: 10
+  buffer-threshold: 0
+  rpc-timeout: 2m
+```
+
+### Network options
+#### `url`
+Tezos node RPC URL.
+
+#### `chain-id`
+The proper Base58 chain id.
+
+#### `seed`
+512 byte seed from which all keys are being derived using SLIP-10 algorithm. Use `seed-file` to read the hex encoded seed from an external file. The seed can also be specified using an environment variable `NET_SEED`
+where `NET` prefix is the network name in uppercase.
+
+#### `private-key`
+The Base58 encoded funding wallet key. Use `private-key-file` to read the Base58 encoded key from an external file. The key can also be specified using an environment variable `NET_PRIVATE_KEY` where `NET` prefix is the network name in uppercase.
+
+#### `min-balance`
+Minimal residual balance. The 'ephemeral' key will be discarded if its balance is below this value.
+
+#### `amount`
+The funding amount.
+
+#### `ops-per-group`
+The maximum number of transactions signed and injected as a single group.
+
+#### `lease-time`
+The duration after which the ephemeral key gets recycled.
+
+#### `buffer-length`
+The number of pre-funded keys in the queue.
+
+#### `buffer-threshold`
+Refill the queue when its length hits this value.
+
+#### `rpc-timeout`
+Tezos RPC timeout.
+
+## Environment variables
+#### `KEYGEN_NETWORKS`
+Can be used as an alternative to `-n` command line option
+
+### `KEYGEN_NETWORKS_DATA`
+Contains network configuration in YAML format. Overrides both `-l` option and `KEYGEN_NETWORKS` variable.
+
+#### `KEYGEN_DB`
+Can be used as an alternative to `-d` command line option
+
+### `*_PRIVATE_KEY`
+See `private-key` above
+
+### `*_SEED`
+See `seed` above
\ No newline at end of file
diff --git a/main.go b/main.go
index 551b4fa..7e97409 100644
--- a/main.go
+++ b/main.go
@@ -39,8 +39,8 @@ func main() {
 	flag.StringVar(&networksFile, "n", "", "Networks configuration file")
 	flag.StringVar(&databaseFile, "d", "", "Database")
 	flag.StringVar(&address, "a", ":3000", "Address")
-	flag.StringVar(&level, "l", "info", "Level")
-	flag.BoolVar(&genSeed, "seed", false, "Generate seed and exit")
+	flag.StringVar(&level, "l", "info", "Level [panic,fatal,error,warn,info,debug,trace]")
+	flag.BoolVar(&genSeed, "seed", false, "Generate 512 bit seed and exit")
 	flag.Parse()
 
 	l, err := log.ParseLevel(level)