diff --git a/README.md b/README.md
index 23e1c6b..2a042d9 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,9 @@ Extends [PHP memcached](https://www.php.net/manual/en/book.memcached.php)
 #### Init
 
 ```
-$memory = new Yggverse\Cache\Memory(
+$memory = new \Yggverse\Cache\Memory(
 
-  'localhost,   // memcached server host, localhost by default
+  'localhost',  // memcached server host, localhost by default
   11211,        // memcached server port, 11211 by default
 
   'my_app',     // application namespace
diff --git a/src/Memory.php b/src/Memory.php
index 38d93f8..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(
       [
@@ -43,7 +43,7 @@ class Memory {
     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(
       [
@@ -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