diff --git a/Cargo.toml b/Cargo.toml
index 60d22a1..0d54844 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,10 @@
 [package]
 name = "charsets"
-version = "0.2.0"
-authors = ["Pyfisch <pyfisch@gmail.com>"]
+version = "0.3.0"
+authors = [
+  "Pyfisch <pyfisch@gmail.com>",
+	"Emma Tebibyte <emma@tebibyte.media>",
+]
 description = "An enum representing all charset names commonly used."
 readme = "README.md"
 documentation = "http://pyfisch.github.io/rust-charsets/rust-charsets/index.html"
diff --git a/src/lib.rs b/src/lib.rs
index 96394a4..fb03729 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,27 @@
+/*
+ * Copyright © 2016 pyfisch <pyfisch@gmail.com>
+ * Copyright © 2023 Emma Tebibyte <emma@tebibyte.media>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the “Software”), to deal
+ * in the Software without restriction, including without limitation the rights 
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#![no_std]
 #![cfg_attr(test, deny(missing_docs))]
 #![cfg_attr(test, deny(warnings))]
 
@@ -9,9 +33,17 @@
 //! Charset names can be parsed from string, formatted to string and compared.
 //! Unregistered charsets are represented using an `Unregistered` variant.
 
-use std::fmt::{self, Display};
-use std::str::FromStr;
-use std::ascii::AsciiExt;
+extern crate alloc;
+
+use alloc::{
+    borrow::ToOwned,
+    string::{ String, ToString },
+};
+
+use core::{
+    fmt::{self, Display},
+    str::FromStr,
+};
 
 pub use self::Charset::*;
 
@@ -121,12 +153,14 @@ impl Display for Charset {
 }
 
 impl FromStr for Charset {
-    type Err = ();
-    fn from_str(s: &str) -> Result<Charset, ()> {
-        Ok(MAPPING.iter()
-                  .find(|&&(_, ref name)| name.eq_ignore_ascii_case(s))
-                  .map(|&(ref variant, _)| variant.to_owned())
-                  .unwrap_or(Unregistered(s.to_owned())))
+    type Err = Charset; 
+    fn from_str(s: &str) -> Result<Charset, Charset> {
+        match MAPPING.iter()
+                     .find(|&&(_, ref name)| name.eq_ignore_ascii_case(s))
+                     .map(|&(ref variant, _)| variant.to_owned()) {
+                         Some(variant) => Ok(variant),
+                         None => Err(Unregistered(s.to_owned())),
+        }
     }
 }
 
@@ -174,7 +208,8 @@ mod tests {
         assert_eq!(UsAscii, "US-Ascii".parse().unwrap());
         assert_eq!(UsAscii, "US-ASCII".parse().unwrap());
         assert_eq!(ShiftJis, "Shift-JIS".parse().unwrap());
-        assert_eq!(Unregistered("ABCD".to_owned()), "abcd".parse().unwrap());
+        assert_eq!(Unregistered("ABCD".to_owned()),
+                   "abcd".parse::<Charset>().err().unwrap());
     }
 
     #[test]