diff --git a/Modules/Segmentation/Controllers/mitkToolManagerProvider.h b/Modules/Segmentation/Controllers/mitkToolManagerProvider.h
index 1e95417212..bfd41378a6 100644
--- a/Modules/Segmentation/Controllers/mitkToolManagerProvider.h
+++ b/Modules/Segmentation/Controllers/mitkToolManagerProvider.h
@@ -1,61 +1,76 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #ifndef MITK_TOOLMANAGERPROVIDER_H
 #define MITK_TOOLMANAGERPROVIDER_H
 
 #include "SegmentationExports.h"
 
 #include <usModuleContext.h>
 #include <usServiceInterface.h>
 
 #include "mitkToolManager.h"
 #include <itkObjectFactory.h>
 #include <mitkCommon.h>
 
 //class SegmentationModuleActivator;
 
 namespace mitk
 {
 
+  /**
+   \brief Micro Service Singleton to get an instance of mitk::ToolManager
+
+   \sa ToolManager
+
+   Implemented as a singleton to have implicitely only one instance of ToolManager.
+   Use this service to make sure your Tools are managed by the object.
+
+   \note Can only be instantiated by SegmentationModuleActivator.
+  */
   class Segmentation_EXPORT ToolManagerProvider : public itk::LightObject
   {
   public:
     mitkClassMacro(ToolManagerProvider, itk::LightObject);
     itkNewMacro(ToolManagerProvider);
 
+    /** \brief Returns ToolManager object
+    \note As this service is implemented as a singleton there is always the same ToolManager instance returned.
+    */
     virtual mitk::ToolManager* GetToolManager();
 
+    /** \brief Returns an instance of ToolManagerProvider service */
     static mitk::ToolManagerProvider* GetInstance();
 
+    //ONLY SegmentationModuleActivator is able to create instances of the service
     //friend class SegmentationModuleActivator;
 
   protected:
     //mitkClassMacro(ToolManagerProvider, itk::LightObject);
     //itkNewMacro(Self);
 
     ToolManagerProvider();
     virtual ~ToolManagerProvider();
     ToolManagerProvider(const ToolManagerProvider&);
     ToolManagerProvider& operator=(const ToolManagerProvider&);
 
     mitk::ToolManager::Pointer m_ToolManager;
   };
 }
 
 US_DECLARE_SERVICE_INTERFACE(mitk::ToolManagerProvider, "org.mitk.services.ToolManagerProvider")
 
 #endif