diff --git a/Cargo.toml b/Cargo.toml
index 7d1e89b..384b080 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "plurify"
-version = "0.1.1"
+version = "0.2.1"
 edition = "2021"
 
 license = "MIT"
diff --git a/README.md b/README.md
index 351f3cd..db504e5 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # plurify
 
 ![Build](https://github.com/YGGverse/plurify/actions/workflows/build.yml/badge.svg)
+[![Documentation](https://docs.rs/plurify/badge.svg)](https://docs.rs/plurify)
+[![crates.io](https://img.shields.io/crates/v/plurify.svg)](https://crates.io/crates/plurify)
 
 Pluralize words in different locales
 
@@ -15,16 +17,16 @@ cargo add plurify
 ## Usage
 
 ``` rust
-use plurify::ns;
+use plurify::*;
 
 let en = &["cat", "cats", "cats"];
 let uk = &["кіт", "кота", "котів"];
 
-assert_eq!(ns(1, en), "cat");
-assert_eq!(ns(2, en), "cats");
-assert_eq!(ns(5, en), "cats");
+assert_eq!(1.plurify(en), "cat");
+assert_eq!(2.plurify(en), "cats");
+assert_eq!(5.plurify(en), "cats");
 
-assert_eq!(ns(1, uk), "кіт");
-assert_eq!(ns(2, uk), "кота");
-assert_eq!(ns(5, uk), "котів");
+assert_eq!(1.plurify(uk), "кіт");
+assert_eq!(2.plurify(uk), "кота");
+assert_eq!(5.plurify(uk), "котів");
 ```
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index e080b8e..7bccda8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,24 +1,55 @@
-/// Get plural string `s` match number `n`
+// Functions
+
+/// Get plural string `s` for number `n`
 ///
 /// ## Example
 /// ``` rust
-/// use plurify::ns;
+/// use plurify::*;
 ///
 /// let en = &["cat", "cats", "cats"];
 /// let uk = &["кіт", "кота", "котів"];
 ///
-/// assert_eq!(ns(1, en), "cat");
-/// assert_eq!(ns(2, en), "cats");
-/// assert_eq!(ns(5, en), "cats");
+/// assert_eq!(plurify(1, en), "cat");
+/// assert_eq!(plurify(2, en), "cats");
+/// assert_eq!(plurify(5, en), "cats");
 ///
-/// assert_eq!(ns(1, uk), "кіт");
-/// assert_eq!(ns(2, uk), "кота");
-/// assert_eq!(ns(5, uk), "котів");
+/// assert_eq!(plurify(1, uk), "кіт");
+/// assert_eq!(plurify(2, uk), "кота");
+/// assert_eq!(plurify(5, uk), "котів");
 /// ```
-pub fn ns<'a>(n: usize, s: &[&'a str]) -> &'a str {
+pub fn plurify<'a>(n: usize, s: &[&'a str]) -> &'a str {
     s[if n % 100 > 4 && n % 100 < 20 {
         2
     } else {
         [2, 0, 1, 1, 1, 2][usize::min(n % 10, 5)]
     }]
 }
+
+// Traits
+
+pub trait Plurify {
+    fn plurify<'a>(self, s: &[&'a str]) -> &'a str;
+}
+
+impl Plurify for usize {
+    /// Get plural string for `usize` value
+    ///
+    /// ## Example
+    /// ``` rust
+    /// use plurify::*;
+    ///
+    /// let en = &["cat", "cats", "cats"];
+    /// let uk = &["кіт", "кота", "котів"];
+    ///
+    /// assert_eq!(1.plurify(en), "cat");
+    /// assert_eq!(2.plurify(en), "cats");
+    /// assert_eq!(5.plurify(en), "cats");
+    ///
+    /// assert_eq!(1.plurify(uk), "кіт");
+    /// assert_eq!(2.plurify(uk), "кота");
+    /// assert_eq!(5.plurify(uk), "котів");
+    /// ```
+    fn plurify<'a>(self, s: &[&'a str]) -> &'a str {
+        plurify(self, s)
+    }
+}
diff --git a/tests/integration.rs b/tests/integration.rs
index 957a0bb..81eb0de 100644
--- a/tests/integration.rs
+++ b/tests/integration.rs
@@ -1,15 +1,24 @@
-use plurify::ns;
+#[cfg(test)]
+use plurify::*;
 
 #[test]
-fn _ns() {
+fn test() {
     let en = &["cat", "cats", "cats"];
     let uk = &["кіт", "кота", "котів"];
 
-    assert_eq!(ns(1, en), "cat");
-    assert_eq!(ns(2, en), "cats");
-    assert_eq!(ns(5, en), "cats");
+    assert_eq!(plurify(1, en), "cat");
+    assert_eq!(plurify(2, en), "cats");
+    assert_eq!(plurify(5, en), "cats");
 
-    assert_eq!(ns(1, uk), "кіт");
-    assert_eq!(ns(2, uk), "кота");
-    assert_eq!(ns(5, uk), "котів");
+    assert_eq!(plurify(1, uk), "кіт");
+    assert_eq!(plurify(2, uk), "кота");
+    assert_eq!(plurify(5, uk), "котів");
+
+    assert_eq!(1.plurify(en), "cat");
+    assert_eq!(2.plurify(en), "cats");
+    assert_eq!(5.plurify(en), "cats");
+
+    assert_eq!(1.plurify(uk), "кіт");
+    assert_eq!(2.plurify(uk), "кота");
+    assert_eq!(5.plurify(uk), "котів");
 }