diff --git a/Behavioral/NullObject/LoggerInterface.php b/Behavioral/NullObject/Logger.php
similarity index 89%
rename from Behavioral/NullObject/LoggerInterface.php
rename to Behavioral/NullObject/Logger.php
index fe6a269..c9a345d 100644
--- a/Behavioral/NullObject/LoggerInterface.php
+++ b/Behavioral/NullObject/Logger.php
@@ -6,7 +6,7 @@ namespace DesignPatterns\Behavioral\NullObject;
 /**
  * Key feature: NullLogger must inherit from this interface like any other loggers
  */
-interface LoggerInterface
+interface Logger
 {
     public function log(string $str);
 }
diff --git a/Behavioral/NullObject/NullLogger.php b/Behavioral/NullObject/NullLogger.php
index 2d8b76a..5f19370 100644
--- a/Behavioral/NullObject/NullLogger.php
+++ b/Behavioral/NullObject/NullLogger.php
@@ -3,7 +3,7 @@ declare(strict_types=1);
 
 namespace DesignPatterns\Behavioral\NullObject;
 
-class NullLogger implements LoggerInterface
+class NullLogger implements Logger
 {
     public function log(string $str)
     {
diff --git a/Behavioral/NullObject/PrintLogger.php b/Behavioral/NullObject/PrintLogger.php
index 37f47b6..9eecd5e 100644
--- a/Behavioral/NullObject/PrintLogger.php
+++ b/Behavioral/NullObject/PrintLogger.php
@@ -3,7 +3,7 @@ declare(strict_types=1);
 
 namespace DesignPatterns\Behavioral\NullObject;
 
-class PrintLogger implements LoggerInterface
+class PrintLogger implements Logger
 {
     public function log(string $str)
     {
diff --git a/Behavioral/NullObject/README.rst b/Behavioral/NullObject/README.rst
index 3d2a8d3..0787b7b 100644
--- a/Behavioral/NullObject/README.rst
+++ b/Behavioral/NullObject/README.rst
@@ -43,9 +43,9 @@ Service.php
    :language: php
    :linenos:
 
-LoggerInterface.php
+Logger.php
 
-.. literalinclude:: LoggerInterface.php
+.. literalinclude:: Logger.php
    :language: php
    :linenos:
 
@@ -71,4 +71,4 @@ Tests/LoggerTest.php
    :linenos:
 
 .. _`GitHub`: https://github.com/domnikl/DesignPatternsPHP/tree/master/Behavioral/NullObject
-.. __: http://en.wikipedia.org/wiki/Null_Object_pattern
\ No newline at end of file
+.. __: http://en.wikipedia.org/wiki/Null_Object_pattern
diff --git a/Behavioral/NullObject/Service.php b/Behavioral/NullObject/Service.php
index b44714e..943920d 100644
--- a/Behavioral/NullObject/Service.php
+++ b/Behavioral/NullObject/Service.php
@@ -6,14 +6,14 @@ namespace DesignPatterns\Behavioral\NullObject;
 class Service
 {
     /**
-     * @var LoggerInterface
+     * @var Logger
      */
     private $logger;
 
     /**
-     * @param LoggerInterface $logger
+     * @param Logger $logger
      */
-    public function __construct(LoggerInterface $logger)
+    public function __construct(Logger $logger)
     {
         $this->logger = $logger;
     }
diff --git a/Behavioral/NullObject/uml/uml.png b/Behavioral/NullObject/uml/uml.png
index 9a081be..0f731b3 100644
Binary files a/Behavioral/NullObject/uml/uml.png and b/Behavioral/NullObject/uml/uml.png differ