diff --git a/README.md b/README.md
index 3f2d90b..2a042d9 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,58 @@
 # cache-php
 Cache tools for PHP applications
+
+### Memory
+
+Extends [PHP memcached](https://www.php.net/manual/en/book.memcached.php)
+
+#### Init
+
+```
+$memory = new \Yggverse\Cache\Memory(
+
+  'localhost',  // memcached server host, localhost by default
+  11211,        // memcached server port, 11211 by default
+
+  'my_app',     // application namespace
+  3600 + time() // cache time by default
+);
+```
+
+#### Supported methods
+
+##### Memory::set
+
+##### Memory::delete
+
+##### Memory::flush
+
+##### Memory::get
+
+##### Memory::getByValueCallback
+
+Return cached or cache new value of plain value callback
+
+```
+  $value = $memory->getByValueCallback(
+    'key_name',    // string, unique key name
+    'value',       // mixed, plain value
+    3600 + time(), // optional, cache timeout for this value
+  );
+```
+
+##### Memory::getByMethodCallback
+
+Return cached or cache new value of object method callback
+
+```
+  $value = $memory->getByMethodCallback(
+    $class_object,         // object of method class
+    'method_name',         // object method name
+    [
+      $method_attribute_1, // optional, array of attributes callback method requires
+      $method_attribute_2,
+      ...
+    ]
+    3600 + time(),         // optional, cache timeout for this value
+  );
+```
\ No newline at end of file
diff --git a/src/Memory.php b/src/Memory.php
index 5f06f29..3bc6858 100644
--- a/src/Memory.php
+++ b/src/Memory.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace YGGverse\Cache;
+namespace Yggverse\Cache;
 
 class Memory {
 
@@ -19,7 +19,7 @@ class Memory {
     $this->_timeout   = $timeout;
   }
 
-  public function get(string $key) : mixed
+  public function get(mixed $key) : mixed
   {
     $key = $this->_setKey(
       [
@@ -31,7 +31,7 @@ class Memory {
     return $this->_memcached->get($key);
   }
 
-  public function set(string $key, mixed $value = null, int $timeout = null) : bool
+  public function set(mixed $key, mixed $value = null, int $timeout = null) : bool
   {
     $key = $this->_setKey(
       [
@@ -40,10 +40,10 @@ class Memory {
       ]
     );
 
-    return $this->_memcached->set($key, $value, ($timeout ? $timeout : $this->_timeout) + time());
+    return $this->_memcached->set($key, $value, ($timeout ? $timeout : $this->_timeout));
   }
 
-  public function delete(string $key) : bool
+  public function delete(mixed $key) : bool
   {
     $key = $this->_setKey(
       [
@@ -55,7 +55,7 @@ class Memory {
     return $this->_memcached->delete($key);
   }
 
-  public function getByValueCallback(string $key, mixed $value = null, int $timeout = null) : mixed
+  public function getByValueCallback(mixed $key, mixed $value = null, int $timeout = null) : mixed
   {
     $key = $this->_setKey(
       [
@@ -70,7 +70,7 @@ class Memory {
     }
     else
     {
-      if (true === $this->_memcached->set($key, $value, ($timeout ? $timeout : $this->_timeout) + time()))
+      if (true === $this->_memcached->set($key, $value, ($timeout ? $timeout : $this->_timeout)))
       {
         return $value;
       }
@@ -106,7 +106,7 @@ class Memory {
         $arguments
       );
 
-      if (true === $this->_memcached->set($key, $value, ($timeout ? $timeout : $this->_timeout) + time()))
+      if (true === $this->_memcached->set($key, $value, ($timeout ? $timeout : $this->_timeout)))
       {
         return $value;
       }
@@ -117,9 +117,11 @@ class Memory {
     }
   }
 
-  public function flush(int $delay = 60) : bool
+  public function flush(?int $delay = 0) : bool
   {
-    return $this->_memcached->flush();
+    return $this->_memcached->flush(
+      $delay
+    );
   }
 
   private function _setKey(mixed $key) : string