diff --git a/README.md b/README.md
index c016951..b14dcdf 100644
--- a/README.md
+++ b/README.md
@@ -126,7 +126,7 @@ function getCategoriesCount()
 ```
 
 
-### Simplified interface <span id="simplified-interface"></span>
+### Extended interface <span id="extended-interface"></span>
 
 
 ### Using cache tags <span id="using-cache-tags"></span>
diff --git a/src/CacheItemContract.php b/src/CacheItemContract.php
index 76bb956..2cb7bf6 100644
--- a/src/CacheItemContract.php
+++ b/src/CacheItemContract.php
@@ -5,6 +5,12 @@
 use Psr\Cache\CacheItemInterface;
 
 /**
+ * CacheItemContract extends {@see \Psr\Cache\CacheItemInterface}, adding extra features.
+ *
+ * It allows managing cache dependencies.
+ *
+ * @see \yii1tech\psr\cache\CacheItemPoolContract
+ *
  * @author Paul Klimov <klimov.paul@gmail.com>
  * @since 1.0
  */
diff --git a/src/CacheItemPool.php b/src/CacheItemPool.php
index 9c62a74..7472533 100644
--- a/src/CacheItemPool.php
+++ b/src/CacheItemPool.php
@@ -4,7 +4,6 @@
 
 use CApplicationComponent;
 use Psr\Cache\CacheItemInterface;
-use Psr\Cache\CacheItemPoolInterface;
 use Yii;
 
 /**
@@ -34,7 +33,7 @@
  * @author Paul Klimov <klimov.paul@gmail.com>
  * @since 1.0
  */
-class CacheItemPool extends CApplicationComponent implements CacheItemPoolInterface
+class CacheItemPool extends CApplicationComponent implements CacheItemPoolContract
 {
     /**
      * @var bool whether to automatically commit all deferred items on object destruction.
@@ -230,4 +229,24 @@ public function commit(): bool
 
         return $result;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function get(string $key, callable $callback)
+    {
+        $item = $this->getItem($key);
+
+        if ($item->isHit()) {
+            return $item->get();
+        }
+
+        $value = call_user_func($callback, $item);
+
+        $item->set($value);
+
+        $this->save($item);
+
+        return $value;
+    }
 }
\ No newline at end of file
diff --git a/src/CacheItemPoolContract.php b/src/CacheItemPoolContract.php
new file mode 100644
index 0000000..7532b65
--- /dev/null
+++ b/src/CacheItemPoolContract.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace yii1tech\psr\cache;
+
+use Psr\Cache\CacheItemPoolInterface;
+
+/**
+ * CacheItemPoolContract extends {@see \Psr\Cache\CacheItemPoolInterface}, adding extra features to it.
+ *
+ * @see \yii1tech\psr\cache\CacheItemContract
+ *
+ * @author Paul Klimov <klimov.paul@gmail.com>
+ * @since 1.0
+ */
+interface CacheItemPoolContract extends CacheItemPoolInterface
+{
+    /**
+     * {@inheritdoc}
+     *
+     * @return \yii1tech\psr\cache\CacheItemContract the corresponding Cache Item.
+     */
+    public function getItem($key);
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return \Traversable|array<string, \yii1tech\psr\cache\CacheItemContract> collection of Cache Items keyed by the cache keys of each item.
+     */
+    public function getItems(array $keys = []);
+
+    /**
+     * Fetches a value from the pool or computes it via given callback if not found.
+     * Usage example:
+     *
+     * ```php
+     * $value = $pool->get('example-cache-key', function (CacheItemContract $item) {
+     *     $item->expiresAfter(3600);
+     *
+     *     // ...
+     *
+     *     return $computedValue; // heavy computations result
+     * });
+     * ```
+     *
+     * @template T
+     *
+     * @param string $key the key of the item to retrieve from the cache.
+     * @param (callable(CacheItemContract,bool):T)|(callable(CacheItemContract,bool):T) $callback callback, which computes value to be cached.
+     * @return T cached value or callback result.
+     */
+    public function get(string $key, callable $callback);
+
+    //public function invalidateTags(array $tags);
+}
\ No newline at end of file
diff --git a/tests/CacheItemPoolTest.php b/tests/CacheItemPoolTest.php
index ec6d574..6e9c253 100644
--- a/tests/CacheItemPoolTest.php
+++ b/tests/CacheItemPoolTest.php
@@ -5,6 +5,7 @@
 use CDummyCache;
 use DateInterval;
 use ICache;
+use yii1tech\psr\cache\CacheItemContract;
 use yii1tech\psr\cache\CacheItemPool;
 
 class CacheItemPoolTest extends TestCase
@@ -232,4 +233,35 @@ public function testSaveWithDependency(): void
         $item = $pool->getItem($key);
         $this->assertFalse($item->isHit());
     }
+
+    /**
+     * @depends testSave
+     */
+    public function testGetCallback(): void
+    {
+        $pool = new CacheItemPool();
+
+        $key = 'test';
+
+        $value = $pool->get($key, function (CacheItemContract $item) {
+            $item->expiresAfter(DateInterval::createFromDateString('1 hour'));
+
+            return 'test-value';
+        });
+
+        $this->assertSame('test-value', $value);
+
+        $item = $pool->getItem($key);
+        $this->assertTrue($item->isHit());
+        $this->assertSame('test-value', $item->get());
+
+        $value = $pool->get($key, function (CacheItemContract $item) {
+            $item->expiresAfter(DateInterval::createFromDateString('1 hour'));
+
+            return 'new-value';
+        });
+
+        $this->assertSame('test-value', $value);
+        $this->assertSame('test-value', $pool->getItem($key)->get());
+    }
 }
\ No newline at end of file