diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6c8e64..9fa6458 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
-- No pending changes
+### Added
+- Mock for the `PDO::commit()` method
+- Mock for the `PDO::rollBack()` method
+- `rolled_back` property to `Stratedge\Wye\Transaction`
+- `getRolledBack()` method to `Stratedge\Wye\Transaction`
+- `setRolledBack()` method to `Stratedge\Wye\Transaction`
 
 ## [0.3.0] - 2017-05-23
 ### Added
@@ -17,9 +22,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 - Move documentation from README.md to Github wiki - [https://github.com/stratedge/wye/wiki](https://github.com/stratedge/wye/wiki)
 - Remove the `params` property from `Stratedge\Wye\PDO\PDOStatement`
-- Remove `params` method from `Stratedge\Wye\PDO\PDOStatement`
-- Remove `getParams` method from `Stratedge\Wye\PDO\PDOStatement`
-- Remove `setParams` method from `Stratedge\Wye\PDO\PDOStatement`
+- Remove `params()` method from `Stratedge\Wye\PDO\PDOStatement`
+- Remove `getParams()` method from `Stratedge\Wye\PDO\PDOStatement`
+- Remove `setParams()` method from `Stratedge\Wye\PDO\PDOStatement`
 - Drop support for HHVM <= 3.6
 
 ## [0.2.0] - 2017-05-02
diff --git a/src/PDO/PDO.php b/src/PDO/PDO.php
index c9d0fb2..ddaaf36 100644
--- a/src/PDO/PDO.php
+++ b/src/PDO/PDO.php
@@ -10,7 +10,7 @@
 
 /**
  * @todo
- *   - Implement the `commit` method
+ *   - Finish the `commit` method
  *   - Implement the `errorCode` method
  *   - Implement the `errorInfo` method
  *   - Implement the `exec` method
@@ -19,7 +19,7 @@
  *   - Implement the `inTransaction` method
  *   - Finish the `lastInsertId` method
  *   - Implement the `query` method
- *   - Implement the `rollBack` method
+ *   - Finish the `rollBack` method
  *   - Implement the `setAttribute` method
  */
 class PDO extends BasePDO
@@ -53,6 +53,21 @@ public function beginTransaction()
         return true;
     }
 
+    /**
+     * Mimic for PDO::commit(). Commits the currently active transaction, or
+     * throws a PDOException if no transaction exists.
+     *
+     * @todo Allow false to be returned.
+     *
+     * @return true
+     */
+    public function commit()
+    {
+        $this->getWye()->commitTransaction();
+
+        return true;
+    }
+
     /**
      * Mimic for PDO::lastInsertId(). Returns the last insert ID value for the
      * last used statement result.
@@ -108,4 +123,19 @@ public function quote($string, $paramtype = null)
 
         return $this->wye()->quote($string);
     }
+
+    /**
+     * Mimic for PDO::rollBack(). Rolls back the currently active transaction,
+     * or throws a PDOException if no transaction exists.
+     *
+     * @todo Allow false to be returned.
+     *
+     * @return true
+     */
+    public function rollBack()
+    {
+        $this->getWye()->rollBackTransaction();
+
+        return true;
+    }
 }
diff --git a/src/Transaction.php b/src/Transaction.php
index d23329e..eddd057 100644
--- a/src/Transaction.php
+++ b/src/Transaction.php
@@ -12,10 +12,15 @@ class Transaction
     protected $index;
 
     /**
-     * @var committed
+     * @var boolean
      */
     protected $committed = false;
 
+    /**
+     * @var boolean
+     */
+    protected $rolled_back = false;
+
     /**
      * @var array
      */
@@ -79,6 +84,31 @@ public function setCommitted($committed)
     }
 
 
+    //**************************************************************************
+    // ROLLED_BACK
+    //**************************************************************************
+
+    /**
+     * Returns the value of the rolled_back property.
+     *
+     * @return boolean
+     */
+    public function getRolledBack()
+    {
+        return $this->rolled_back;
+    }
+
+    /**
+     * Sets the value of the rolled_back property.
+     *
+     * @param boolean $rolled_back
+     */
+    public function setRolledBack($rolled_back)
+    {
+        $this->rolled_back = (bool) $rolled_back;
+    }
+
+
 
     //**************************************************************************
     // STATEMENTS
diff --git a/src/Wye.php b/src/Wye.php
index 3ffaa1c..e58390a 100644
--- a/src/Wye.php
+++ b/src/Wye.php
@@ -229,6 +229,49 @@ public static function beginTransaction()
     }
 
 
+    /**
+     * Marks the current transaction as committed and removes Wye from
+     * transaction mode. If no transaction exists, throws a PDOException.
+     *
+     * @todo Flesh out the details for the PDOException properly.
+     *
+     * @throws PDOException
+     *
+     * @return void
+     */
+    public static function commitTransaction()
+    {
+        if (static::getInTransaction() !== true) {
+            throw new PDOException();
+        }
+
+        static::setInTransaction(false);
+
+        static::currentTransaction()->setCommitted(true);
+    }
+
+    /**
+     * Marks the current transaction as rolled back and removes Wye from
+     * transaction mode. If no transaction exists, throws a PDOException.
+     *
+     * @todo Flesh out the details for the PDOException properly.
+     *
+     * @throws PDOException
+     *
+     * @return void
+     */
+    public static function rollBackTransaction()
+    {
+        if (static::getInTransaction() !== true) {
+            throw new PDOException();
+        }
+
+        static::setInTransaction(false);
+
+        static::currentTransaction()->setRolledBack(true);
+    }
+
+
 
     //**************************************************************************
     // STATEMENTS
diff --git a/tests/PDO/PDO/CommitTest.php b/tests/PDO/PDO/CommitTest.php
new file mode 100644
index 0000000..2f75db3
--- /dev/null
+++ b/tests/PDO/PDO/CommitTest.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace Tests\PDO\PDO;
+
+use PDOException;
+use Stratedge\Wye\Wye;
+
+class CommitTest extends \Tests\TestCase
+{
+    public function testNoTransactionThrowsException()
+    {
+        $this->setExpectedException(PDOException::class);
+
+        Wye::makePDO()->commit();
+    }
+
+    public function testMarksLastTransactionCommitted()
+    {
+        $pdo = Wye::makePDO();
+
+        $pdo->beginTransaction();
+
+        $transaction = Wye::currentTransaction();
+
+        $this->assertFalse($transaction->getCommitted());
+
+        $pdo->commit();
+
+        $this->assertTrue($transaction->getCommitted());
+    }
+
+    public function testReturnsTrue()
+    {
+        $pdo = Wye::makePDO();
+
+        $pdo->beginTransaction();
+
+        $this->assertTrue($pdo->commit());
+    }
+
+    public function testMarksWyeNoLongerInTransaction()
+    {
+        $pdo = Wye::makePDO();
+
+        $this->assertFalse(Wye::getInTransaction());
+
+        $pdo->beginTransaction();
+
+        $this->assertTrue(Wye::getInTransaction());
+
+        $pdo->commit();
+
+        $this->assertFalse(Wye::getInTransaction());
+    }
+}
diff --git a/tests/PDO/PDO/RollBackTest.php b/tests/PDO/PDO/RollBackTest.php
new file mode 100644
index 0000000..9b8cbe2
--- /dev/null
+++ b/tests/PDO/PDO/RollBackTest.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace Tests\PDO\PDO;
+
+use PDOException;
+use Stratedge\Wye\Wye;
+
+class RollBackTest extends \Tests\TestCase
+{
+    public function testNoTransactionThrowsException()
+    {
+        $this->setExpectedException(PDOException::class);
+
+        Wye::makePDO()->rollBack();
+    }
+
+    public function testMarksLastTransactionRolledBack()
+    {
+        $pdo = Wye::makePDO();
+
+        $pdo->beginTransaction();
+
+        $transaction = Wye::currentTransaction();
+
+        $this->assertFalse($transaction->getRolledBack());
+
+        $pdo->rollBack();
+
+        $this->assertTrue($transaction->getRolledBack());
+    }
+
+    public function testReturnsTrue()
+    {
+        $pdo = Wye::makePDO();
+
+        $pdo->beginTransaction();
+
+        $this->assertTrue($pdo->rollBack());
+    }
+
+    public function testMarksWyeNoLongerInTransaction()
+    {
+        $pdo = Wye::makePDO();
+
+        $this->assertFalse(Wye::getInTransaction());
+
+        $pdo->beginTransaction();
+
+        $this->assertTrue(Wye::getInTransaction());
+
+        $pdo->rollBack();
+
+        $this->assertFalse(Wye::getInTransaction());
+    }
+}
diff --git a/tests/Transaction/GetRolledBackTest.php b/tests/Transaction/GetRolledBackTest.php
new file mode 100644
index 0000000..4e6e875
--- /dev/null
+++ b/tests/Transaction/GetRolledBackTest.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Tests\Transaction;
+
+use Stratedge\Wye\Wye;
+
+class GetRolledBackTest extends \Tests\TestCase
+{
+    public function testReturnsPropertyValue()
+    {
+        $transaction = Wye::makeTransaction();
+
+        $this->assertFalse($transaction->getRolledBack());
+
+        $transaction->setRolledBack(true);
+
+        $this->assertTrue($transaction->getRolledBack());
+    }
+}
diff --git a/tests/Transaction/SetRolledBackTest.php b/tests/Transaction/SetRolledBackTest.php
new file mode 100644
index 0000000..eb87935
--- /dev/null
+++ b/tests/Transaction/SetRolledBackTest.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Tests\Transaction;
+
+use Stratedge\Wye\Wye;
+
+class SetRolledBackTest extends \Tests\TestCase
+{
+    public function testSetsPropertyValue()
+    {
+        $transaction = Wye::makeTransaction();
+
+        $this->assertFalse($transaction->getRolledBack());
+
+        $transaction->setRolledBack(true);
+
+        $this->assertTrue($transaction->getRolledBack());
+
+        $transaction->setRolledBack(false);
+
+        $this->assertFalse($transaction->getRolledBack());
+    }
+}
diff --git a/tests/Wye/CommitTransactionTest.php b/tests/Wye/CommitTransactionTest.php
new file mode 100644
index 0000000..c249ebd
--- /dev/null
+++ b/tests/Wye/CommitTransactionTest.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Tests\Wye;
+
+use PDOException;
+use Stratedge\Wye\Wye;
+
+class CommitTransactionTest extends \Tests\TestCase
+{
+    public function testNoTransactionThrowsException()
+    {
+        $this->setExpectedException(PDOException::class);
+        Wye::commitTransaction();
+    }
+
+    public function testMarksTransactionCommitted()
+    {
+        Wye::beginTransaction();
+
+        $transaction = Wye::currentTransaction();
+
+        $this->assertFalse($transaction->getCommitted());
+
+        Wye::commitTransaction();
+
+        $this->assertTrue($transaction->getCommitted());
+    }
+
+    public function testSetsInTransactionToFalse()
+    {
+        $this->assertFalse(Wye::getInTransaction());
+
+        Wye::beginTransaction();
+
+        $this->assertTrue(Wye::getInTransaction());
+
+        Wye::commitTransaction();
+
+        $this->assertFalse(Wye::getInTransaction());
+    }
+}
diff --git a/tests/Wye/RollBackTransactionTest.php b/tests/Wye/RollBackTransactionTest.php
new file mode 100644
index 0000000..52117a1
--- /dev/null
+++ b/tests/Wye/RollBackTransactionTest.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Tests\Wye;
+
+use PDOException;
+use Stratedge\Wye\Wye;
+
+class RollBackTransactionTest extends \Tests\TestCase
+{
+    public function testNoTransactionThrowsException()
+    {
+        $this->setExpectedException(PDOException::class);
+        Wye::rollBackTransaction();
+    }
+
+    public function testMarksTransactionRolledBack()
+    {
+        Wye::beginTransaction();
+
+        $transaction = Wye::currentTransaction();
+
+        $this->assertFalse($transaction->getRolledBack());
+
+        Wye::rollBackTransaction();
+
+        $this->assertTrue($transaction->getRolledBack());
+    }
+
+    public function testSetsInTransactionToFalse()
+    {
+        $this->assertFalse(Wye::getInTransaction());
+
+        Wye::beginTransaction();
+
+        $this->assertTrue(Wye::getInTransaction());
+
+        Wye::rollBackTransaction();
+
+        $this->assertFalse(Wye::getInTransaction());
+    }
+}