diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..a19a38e
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,19 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.3.0] - 2023-01-06
+
+
+### Added
+
+- this changelog :)
+
+### Changed
+
+- refactored the interface and internals a bit. In short, the library should no longer panic on any errors and should return a sane `Result` so it can be handled by the crate user.
+- made methods `WolPacket::from_string` and `WolPacket::mac_to_byte` more flexible by making the `data` an `AsRef<str>`.
+- `wakey-wake` no longer needs an `-m` or `--mac` flag. The adress is now a positional argument so just call the binary with the appropriate address.
diff --git a/README.md b/README.md
index 2ffed91..6b576b0 100644
--- a/README.md
+++ b/README.md
@@ -11,11 +11,11 @@ Library for managing Wake-on-LAN packets. It supports:
 
 From string representation of MAC address and using defaults when broadcasting:
 ```rust
-let wol = wakey::WolPacket::from_string("01:02:03:04:05:06", ':');
+let wol = wakey::WolPacket::from_string(&mac_adress, sep)?;
 if wol.send_magic().is_ok() {
-    println!("Sent the magic packet!");
+    println!("Sent the magic packet.");
 } else {
-    println!("Failed to send the magic packet!");
+    println!("Failed to send the magic packet.");
 }
 ```
 
@@ -23,15 +23,15 @@ Packets can also be constructed with raw bytes and sent from / to custom address
 ```rust
 use std::net::SocketAddr;
 
-let wol = wakey::WolPacket::from_bytes(&[0x00, 0x01, 0x02, 0x03, 0x04, 0x05]);
+let wol = wakey::WolPacket::from_bytes(&[0x00, 0x01, 0x02, 0x03, 0x04, 0x05])?;
 let src = SocketAddr::from(([0,0,0,0], 0));
 let dst = SocketAddr::from(([255,255,255,255], 9));
 
-wol.send_magic_to(src, dst);
+wol.send_magic_to(src, dst)?;
 ```
 
 ## Included binary
 
 ```
-cargo run --bin wakey-wake -m 00:11:22:33:44:55
+cargo run --bin wakey-wake 00:11:22:33:44:55
 ```
diff --git a/wakey-wake/Cargo.toml b/wakey-wake/Cargo.toml
index b51877c..7196507 100644
--- a/wakey-wake/Cargo.toml
+++ b/wakey-wake/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wakey-wake"
-version = "0.2.2"
+version = "0.3.0"
 
 authors = ["Hubert Bugaj<lesny.rumcajs@gmail.com>"]
 edition = "2021"
@@ -14,4 +14,4 @@ categories = ["network-programming"]
 
 [dependencies]
 wakey = { path = "../wakey" }
-clap = { version = "4.0.15", features = ["derive"] }
+clap = { version = "4.0", features = ["derive"] }
diff --git a/wakey-wake/src/main.rs b/wakey-wake/src/main.rs
index aa9e261..51008ba 100644
--- a/wakey-wake/src/main.rs
+++ b/wakey-wake/src/main.rs
@@ -1,25 +1,24 @@
 use clap::Parser;
 
 #[derive(Parser)]
-#[clap(about = "WakeOnLan a device. https://github.com/LesnyRumcajs/wakey.git", long_about = None)]
+#[clap(author, version, about, long_about = None)]
 struct CmdArgs {
-    /// mac address to send packet to
-    #[clap(short, long)]
-    mac: Option<String>,
+    /// MAC address to send packet to. Should be in format AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF or
+    /// AA/BB/CC/DD/EE/FF.
+    mac_address: String,
 }
 
 fn main() -> wakey::Result<()> {
-    let args = CmdArgs::parse();
-    if let Some(m) = args.mac {
-        let sep = m.chars().find(|ch| *ch == ':' || *ch == '-').unwrap_or('/');
-        let wol = wakey::WolPacket::from_string(&m, sep)?;
-        if wol.send_magic().is_ok() {
-            println!("sent the magic packet.");
-        } else {
-            println!("failed to send the magic packet.");
-        }
+    let mac_adress = CmdArgs::parse().mac_address;
+    let sep = mac_adress
+        .chars()
+        .find(|ch| *ch == ':' || *ch == '-' || *ch == '/')
+        .expect("Invalid MAC address format. Please use one of the separators: [:, -, /]");
+    let wol = wakey::WolPacket::from_string(&mac_adress, sep)?;
+    if wol.send_magic().is_ok() {
+        println!("Sent the magic packet.");
     } else {
-        println!("give mac address to wake up");
+        println!("Failed to send the magic packet.");
     }
 
     Ok(())
diff --git a/wakey/Cargo.toml b/wakey/Cargo.toml
index c03800f..05e413e 100644
--- a/wakey/Cargo.toml
+++ b/wakey/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wakey"
-version = "0.2.2"
+version = "0.3.0"
 
 authors = ["Hubert Bugaj<lesny.rumcajs@gmail.com>"]
 edition = "2021"