diff --git a/Cargo.lock b/Cargo.lock
index 209469f..1708c04 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,18 +8,111 @@ version = "1.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "080e9890a082662b09c1ad45f567faeeb47f22b5fb23895fbe1e651e718e25ca"
 
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "bytes"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
+[[package]]
+name = "clap"
+version = "3.2.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
+dependencies = [
+ "atty",
+ "bitflags",
+ "clap_derive",
+ "clap_lex",
+ "indexmap",
+ "once_cell",
+ "strsim",
+ "termcolor",
+ "textwrap",
+]
+
+[[package]]
+name = "clap_derive"
+version = "3.2.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae6371b8bdc8b7d3959e9cf7b22d4435ef3e79e138688421ec654acf8c81b008"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
+dependencies = [
+ "os_str_bytes",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+
+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "indexmap"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.153"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
+
 [[package]]
 name = "num-derive"
 version = "0.4.1"
@@ -28,7 +121,7 @@ checksum = "cfb77679af88f8b125209d354a202862602672222e7f2313fdd6dc349bad4712"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.48",
 ]
 
 [[package]]
@@ -40,6 +133,42 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "once_cell"
+version = "1.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
+
+[[package]]
+name = "os_str_bytes"
+version = "6.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2355d85b9a3786f481747ced0e0ff2ba35213a1f9bd406ed906554d7af805a1"
+
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.78"
@@ -64,11 +193,29 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "bytes",
+ "clap",
  "num-derive",
  "num-traits",
  "thiserror",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.48"
@@ -80,6 +227,21 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "222a222a5bfe1bba4a77b45ec488a741b3cb8872e5e499451fd7d0129c9c7c3d"
+
 [[package]]
 name = "thiserror"
 version = "1.0.56"
@@ -97,7 +259,7 @@ checksum = "fa0faa943b50f3db30a20aa7e265dbc66076993efed8463e8de414e5d06d3471"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.48",
 ]
 
 [[package]]
@@ -105,3 +267,40 @@ name = "unicode-ident"
 version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f29e6f9198ba0d26b4c9f07dbe6f9ed633e1f3d5b8b414090084349e46a52596"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index 5ea0e64..81b7fb5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,4 +10,7 @@ thiserror = "1.0"
 anyhow = "1.0"
 bytes = "1"
 num-traits = "0.2"
-num-derive = "0.4"
\ No newline at end of file
+num-derive = "0.4"
+
+[dev-dependencies]
+clap = { version = "3", features = ["derive"] }
\ No newline at end of file
diff --git a/examples/palworld.rs b/examples/palworld.rs
index 467018c..213d731 100644
--- a/examples/palworld.rs
+++ b/examples/palworld.rs
@@ -1,11 +1,33 @@
+//! Palworld client example.
+//!
+//! # Usage Examples
+//!
+//! ```bash
+//! $ cargo run --example palworld -- --help
+//! $ cargo run --example palworld -- -a 127.0.0.1:25575 -p passwrd -c "Info"
+//! ```
 use std::io::{Read, Write};
 use std::net::TcpStream;
 use std::time::Duration;
 
-use anyhow::Result;
+use anyhow::{anyhow, Result};
+use clap::Parser;
 
 use rcon::client::RconClient;
 
+#[derive(Debug, Parser)]
+#[clap(name = "palworld")]
+struct Args {
+    #[clap(long, short = 'a', default_value = "127.0.0.1:25575")]
+    remote_address: String,
+
+    #[clap(long, short = 'p', default_value = "password here")]
+    rcon_password: String,
+
+    #[clap(long, short = 'c', default_value = "Info")]
+    command: String,
+}
+
 #[derive(Debug)]
 pub struct PalworldClient {
     stream: TcpStream,
@@ -30,14 +52,24 @@ impl RconClient for PalworldClient {
     }
 }
 
-fn main() {
-    let mut client =
-        PalworldClient::new("127.0.0.1:25575".to_string()).expect("failed to initiate client");
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args = Args::parse();
 
-    client.auth("<password here>").expect("failed to auth");
+    let mut client = PalworldClient::new(args.remote_address)?;
+    client.auth(args.rcon_password.as_ref())?;
 
-    let result = client
-        .execute_command("Info")
-        .expect("failed to execute command");
-    println!("Result:\n{:?}", result);
+    // NOTE: Teleport commands is not supported. because these commands often used in case of playing.
+    if let Some(command) = args.command.split_whitespace().next() {
+        match command {
+            "Shutdown" | "DoExit" | "Broadcast" | "KickPlayer" | "BanPlayer" | "ShowPlayers"
+            | "Info" | "Save" => {
+                let result = client.execute_command(args.command.as_ref())?;
+                println!("{}", result);
+                Ok(())
+            }
+            _ => Err(anyhow!("unsupported command has specified: {}", args.command).into()),
+        }
+    } else {
+        Err(anyhow!("invalid command string: {}", args.command).into())
+    }
 }
diff --git a/src/client/mod.rs b/src/client/mod.rs
index bffdf9c..33399a2 100644
--- a/src/client/mod.rs
+++ b/src/client/mod.rs
@@ -1,3 +1,4 @@
+/// This module provides SRCDS response types.
 pub mod response;
 
 use anyhow::Result;
@@ -8,44 +9,50 @@ use crate::error::ClientError;
 use crate::packet::packet_type::{RequestPacketType, ResponsePacketType};
 use crate::packet::Packet;
 
+/// A trait providing methods for authenticate/execute command to SRCDS.
 pub trait RconClient {
+    /// Sends bytes
     fn send(&mut self, buf: &[u8]) -> Result<(), Box<dyn std::error::Error>>;
+    /// Receives bytes
     fn receive(&mut self, buf: &mut [u8]) -> Result<(), Box<dyn std::error::Error>>;
 
+    /// Authenticate to SRCDS
     fn auth(&mut self, rcon_password: &str) -> Result<AuthResponse, Box<dyn std::error::Error>> {
-        let packet = Packet::default()
-            .identifier(0)
-            .request_packet_type(RequestPacketType::ServerDataAuth)
-            .payload(rcon_password.as_bytes().to_vec());
-        let packet_bytes = Bytes::try_from(packet)?;
-        self.send(&packet_bytes)?;
+        let auth_packet = Bytes::try_from(
+            Packet::default()
+                .identifier(0)
+                .request_packet_type(RequestPacketType::ServerDataAuth)
+                .payload(rcon_password.as_bytes().to_vec()),
+        )?;
+        self.send(&auth_packet)?;
 
         self.receive(&mut [])?; // empty response
 
         let mut auth_bytes = [0u8; 4096];
         self.receive(&mut auth_bytes)?;
-        let mut auth_buf = BytesMut::from(&auth_bytes[..]);
-        let auth_response_packet = Packet::try_from(&mut auth_buf)?;
-
+        let auth_response_packet = Packet::try_from(&mut BytesMut::from(&auth_bytes[..]))?;
         if auth_response_packet.identifier == 0 {
             Ok(AuthResponse::AuthenticationSucceeded)
         } else {
             Err(ClientError::AuthenticationError.into())
         }
     }
+    /// Execute command to SRCDS.
     fn execute_command(&mut self, command: &str) -> Result<String, Box<dyn std::error::Error>> {
-        let command_packet = Packet::default()
-            .identifier(0)
-            .request_packet_type(RequestPacketType::ServerDataExecCommand)
-            .payload(command.as_bytes().to_vec());
-        let command_packet_bytes = Bytes::try_from(command_packet)?;
-        self.send(&command_packet_bytes)?;
+        let command_packet = Bytes::try_from(
+            Packet::default()
+                .identifier(0)
+                .request_packet_type(RequestPacketType::ServerDataExecCommand)
+                .payload(command.as_bytes().to_vec()),
+        )?;
+        self.send(&command_packet)?;
 
-        let empty_packet = Packet::default()
-            .identifier(1)
-            .response_packet_type(ResponsePacketType::ServerDataResponseValue);
-        let empty_packet_bytes = Bytes::try_from(empty_packet)?;
-        self.send(&empty_packet_bytes)?;
+        let empty_packet = Bytes::try_from(
+            Packet::default()
+                .identifier(1)
+                .response_packet_type(ResponsePacketType::ServerDataResponseValue),
+        )?;
+        self.send(&empty_packet)?;
 
         // receive loop (for >4096 payloads)
         let mut buf: Vec<u8> = vec![];
diff --git a/src/client/response.rs b/src/client/response.rs
index 8706608..7deb698 100644
--- a/src/client/response.rs
+++ b/src/client/response.rs
@@ -1,4 +1,7 @@
+/// Enumerates the possible results for srcds authentication.
 pub enum AuthResponse {
+    /// This enumerate describes SERVERDATA_AUTH succeeded
     AuthenticationSucceeded,
+    /// This enumerate describes SERVERDATA_AUTH failed
     AuthenticationFailed,
 }
diff --git a/src/error.rs b/src/error.rs
index fa94104..d8552e4 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,13 +1,17 @@
 use thiserror::Error;
 
+/// Errors for serialize/deserialize packets.
 #[derive(Error, Debug)]
 pub enum PacketError {
+    /// Malformed packet error (wrong identifier, etc...)
     #[error("the packet is malformed")]
     MalformedPacketError,
 }
 
+/// Errors for client operation(authentication/execute_command).
 #[derive(Error, Debug)]
 pub enum ClientError {
+    /// Authentication error (maybe password is wrong?)
     #[error("authentication failed")]
     AuthenticationError,
 }
diff --git a/src/lib.rs b/src/lib.rs
index 20d13a0..929e661 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,16 @@
+//! Rust implementation of SRCDS RCON Protocol.
+//!
+//! Reference: https://developer.valvesoftware.com/wiki/Source_RCON_Protocol
+//!
+//! Example implementations:
+//! - Palworld `Info` command execution example: [palworld.rs](https://github.com/tukeJonny/rcon-rs/blob/master/examples/palworld.rs)
+#![warn(missing_docs)]
 extern crate anyhow;
 extern crate num_derive;
 
+/// This module provides RCON client traits.
 pub mod client;
+
+/// This module provides error types caused by RCON client.
 pub mod error;
 mod packet;