diff --git a/README.md b/README.md
index 649d035..3d92e76 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,8 @@ Note: The methods listed below are subject to change until we reach a 1.0.0 rele
     * [at](#at)
     * [first](#first)
     * [last](#last)
+    * [ensureLeft](#ensureLeft)
+    * [ensureRight](#ensureRight)
 * [Tests](#tests)
 * [License](#license)
 
@@ -646,34 +648,46 @@ S::create('fòô bàř', 'UTF-8')->last(3);
 S::last('fòô bàř', 3, 'UTF-8');  // 'bàř'
 ```
 
+##### ensureLeft
+
+$stringy->ensureLeft(string $substring)
+
+S::ensureLeft(string $substring [, string $encoding ])
+
+Ensures that $str begins with $substring.
+
+```php
+S::create('foobar')->ensureLeft('http://');
+S::ensureLeft('foobar', 'http://');  // 'http://foobar'
+```
+
+##### ensureRight
+
+$stringy->ensureRight(string $substring)
+
+S::ensureRight(string $substring [, string $encoding ])
+
+Ensures that $str ends with $substring.
+
+```php
+S::create('foobar')->ensureRight('.com');
+S::ensureRight('foobar', '.com');  // 'foobar.com'
+```
+
 ## TODO
 
 **count** => substr_count
 
 **wordCount** => str_word_count
 
-**isMultibyte**
-
 **wordWrap**
 
-**chars** $callback
-
-**words** $callback
-
-**paragraphs**
-
-**lines**
-
 **excerpt** ($str, $substring, $radius)
 
 **pluralize** ($count, $singular, $plural = null)
 
 **toBoolean**
 
-**ensureLeft**
-
-**ensureRight**
-
 **isAlpha**
 
 **isAlphaNumeric**
@@ -684,6 +698,10 @@ S::last('fòô bàř', 3, 'UTF-8');  // 'bàř'
 
 **isBlank**
 
+**chompLeft**
+
+**chompRight**
+
 ## Tests
 
 [![Build Status](https://travis-ci.org/danielstjules/Stringy.png)](https://travis-ci.org/danielstjules/Stringy)
diff --git a/src/Stringy/StaticStringy.php b/src/Stringy/StaticStringy.php
index 2d231ba..9843d65 100644
--- a/src/Stringy/StaticStringy.php
+++ b/src/Stringy/StaticStringy.php
@@ -526,4 +526,28 @@ class StaticStringy
     {
         return Stringy::create($str, $encoding)->last($n)->str;
     }
+
+    /**
+     * Ensures that $str begins with $substring.
+     *
+     * @param   string   $substring  The substring to add if not present
+     * @param   string   $encoding   The character encoding
+     * @return  string   The string prefixed by the $substring
+     */
+    public static function ensureLeft($str, $substring, $encoding = null)
+    {
+        return Stringy::create($str, $encoding)->ensureLeft($substring)->str;
+    }
+
+    /**
+     * Ensures that $str ends with $substring.
+     *
+     * @param   string   $substring  The substring to add if not present
+     * @param   string   $encoding   The character encoding
+     * @return  string   The string suffixed by the $substring
+     */
+    public static function ensureRight($str, $substring, $encoding = null)
+    {
+        return Stringy::create($str, $encoding)->ensureRight($substring)->str;
+    }
 }
diff --git a/src/Stringy/Stringy.php b/src/Stringy/Stringy.php
index efc34f4..e568c64 100644
--- a/src/Stringy/Stringy.php
+++ b/src/Stringy/Stringy.php
@@ -824,4 +824,32 @@ class Stringy
 
         return $this;
     }
+
+    /**
+     * Ensures that $str begins with $substring.
+     *
+     * @param   string   $substring  The substring to add if not present
+     * @return  Stringy  Object with its $str prefixed by the $substring
+     */
+    public function ensureLeft($substring)
+    {
+        if (!$this->startsWith($substring))
+            $this->str = $substring . $this->str;
+
+        return $this;
+    }
+
+    /**
+     * Ensures that $str ends with $substring.
+     *
+     * @param   string   $substring  The substring to add if not present
+     * @return  Stringy  Object with its $str suffixed by the $substring
+     */
+    public function ensureRight($substring)
+    {
+        if (!$this->endsWith($substring))
+            $this->str .= $substring;
+
+        return $this;
+    }
 }
diff --git a/tests/Stringy/CommonTest.php b/tests/Stringy/CommonTest.php
index d573e03..cfdb5b9 100644
--- a/tests/Stringy/CommonTest.php
+++ b/tests/Stringy/CommonTest.php
@@ -633,6 +633,42 @@ class CommonTest extends PHPUnit_Framework_TestCase
         return $testData;
     }
 
+    public function stringsForEnsureLeft()
+    {
+        $testData = array(
+            array('foobar', 'foobar', 'f'),
+            array('foobar', 'foobar', 'foo'),
+            array('foo/foobar', 'foobar', 'foo/'),
+            array('http://foobar', 'foobar', 'http://'),
+            array('http://foobar', 'http://foobar', 'http://'),
+            array('fòôbàř', 'fòôbàř', 'f', 'UTF-8'),
+            array('fòôbàř', 'fòôbàř', 'fòô', 'UTF-8'),
+            array('fòô/fòôbàř', 'fòôbàř', 'fòô/', 'UTF-8'),
+            array('http://fòôbàř', 'fòôbàř', 'http://', 'UTF-8'),
+            array('http://fòôbàř', 'http://fòôbàř', 'http://', 'UTF-8'),
+        );
+
+        return $testData;
+    }
+
+    public function stringsForEnsureRight()
+    {
+        $testData = array(
+            array('foobar', 'foobar', 'r'),
+            array('foobar', 'foobar', 'bar'),
+            array('foobar/bar', 'foobar', '/bar'),
+            array('foobar.com/', 'foobar', '.com/'),
+            array('foobar.com/', 'foobar.com/', '.com/'),
+            array('fòôbàř', 'fòôbàř', 'ř', 'UTF-8'),
+            array('fòôbàř', 'fòôbàř', 'bàř', 'UTF-8'),
+            array('fòôbàř/bàř', 'fòôbàř', '/bàř', 'UTF-8'),
+            array('fòôbàř.com/', 'fòôbàř', '.com/', 'UTF-8'),
+            array('fòôbàř.com/', 'fòôbàř.com/', '.com/', 'UTF-8'),
+        );
+
+        return $testData;
+    }
+
     // A test is required so as not to throw an error
     // This is a lot cleaner than using PHPUnit's mocks to spy
     public function test() {
diff --git a/tests/Stringy/StaticStringyTest.php b/tests/Stringy/StaticStringyTest.php
index 89e5277..1eaa0c5 100644
--- a/tests/Stringy/StaticStringyTest.php
+++ b/tests/Stringy/StaticStringyTest.php
@@ -354,4 +354,22 @@ class StaticStringyTestCase extends CommonTest
         $result = S::last($str, $n, $encoding);
         $this->assertEquals($expected, $result);
     }
+
+    /**
+     * @dataProvider stringsForEnsureLeft
+     */
+    public function testEnsureLeft($expected, $str, $substring, $encoding = null)
+    {
+        $result = S::ensureLeft($str, $substring, $encoding);
+        $this->assertEquals($expected, $result);
+    }
+
+    /**
+     * @dataProvider stringsForEnsureRight
+     */
+    public function testEnsureRight($expected, $str, $substring, $encoding = null)
+    {
+        $result = S::ensureRight($str, $substring, $encoding);
+        $this->assertEquals($expected, $result);
+    }
 }
diff --git a/tests/Stringy/StringyTest.php b/tests/Stringy/StringyTest.php
index a233a56..5f52d56 100644
--- a/tests/Stringy/StringyTest.php
+++ b/tests/Stringy/StringyTest.php
@@ -336,4 +336,22 @@ class StringyTestCase extends CommonTest
         $result = S::create($str, $encoding)->last($n);
         $this->assertEquals($expected, $result);
     }
+
+    /**
+     * @dataProvider stringsForEnsureLeft
+     */
+    public function testEnsureLeft($expected, $str, $substring, $encoding = null)
+    {
+        $result = S::create($str, $encoding)->ensureLeft($substring);
+        $this->assertEquals($expected, $result);
+    }
+
+    /**
+     * @dataProvider stringsForEnsureRight
+     */
+    public function testEnsureRight($expected, $str, $substring, $encoding = null)
+    {
+        $result = S::create($str, $encoding)->ensureRight($substring);
+        $this->assertEquals($expected, $result);
+    }
 }