diff --git a/src/Examples/CMakeLists.txt b/src/Examples/CMakeLists.txt
index 30502058716dcbff0831e10012fd19c87597e449..b8e7c574a5ef525d47c68180b252355eeea73f3e 100644
--- a/src/Examples/CMakeLists.txt
+++ b/src/Examples/CMakeLists.txt
@@ -18,6 +18,11 @@ add_subdirectory( flow-vl )
 #add_subdirectory( fast-sweeping-map )
 #add_subdirectory( narrow-band )
 
+ADD_EXECUTABLE( FileExample FileExample.cpp )
+target_link_libraries( FileExample tnl )
 
 ADD_EXECUTABLE( StringExample StringExample.cpp )
-target_link_libraries( StringExample tnl )
\ No newline at end of file
+target_link_libraries( StringExample tnl )
+
+ADD_EXECUTABLE( TimerExample TimerExample.cpp )
+target_link_libraries( TimerExample tnl )
\ No newline at end of file
diff --git a/src/TNL/File.h b/src/TNL/File.h
index c6f55ff7622f5784751047fb1d6ed4dad5f2ccb0..bb31cdcd27ae86d33b6bcc27479d6a1519c30993 100644
--- a/src/TNL/File.h
+++ b/src/TNL/File.h
@@ -37,7 +37,7 @@ enum class IOMode
 const size_t FileGPUvsCPUTransferBufferSize = 5 * 2<<20;
 
 
-/// Class file is aimed mainly for the binary data.
+///\brief Class file is aimed mainly for the binary data.
 ///
 /// \par Example
 /// \include FileExample.cpp
diff --git a/src/TNL/Logger.h b/src/TNL/Logger.h
index 10ecf800c2bebff4f249b3de7d6b16ba5c786e14..bddcfeeebe624cf2226572cfa15b2ddf1b90012d 100644
--- a/src/TNL/Logger.h
+++ b/src/TNL/Logger.h
@@ -15,6 +15,7 @@
 
 namespace TNL {
 
+/// Vytvari tabulku s logem vypoctu   
 class Logger
 {
    public:
@@ -22,41 +23,43 @@ class Logger
    /////
    /// \brief Basic constructor.
    ///
-   /// \param _width Integer that defines the width of logger.
-   /// \param _stream Where to create the logger, e.g. cout or a certain files.
+   /// \param _width Integer that defines the width of the log.
+   /// \param _stream Defines output stream where the log will be printed out.
    Logger( int _width,
               std::ostream& _stream );
 
    /////
-   /// \brief Creates header in given logger.
+   /// \brief Creates header in given log.
+   /// 
+   /// The header usually contains title of the program.
    ///
-   /// \param title String desribing the title/header.
+   /// \param title String containing the header title.
    void writeHeader( const String& title );
 
-   /// \brief Creates predefined separator - structure in the logger.
+   /// \brief Creates separator for structuring the log.
    void writeSeparator();
 
-   /// \brief Inserts information about various system parameters into logger.
+   /// \brief Inserts information about various system parameters into the log.
    ///
-   /// \param parameters
+   /// \param parameters is a container with configuration parameters
    bool writeSystemInformation( const Config::ParameterContainer& parameters );
 
    /////
-   /// \brief Inserts a line with current time into logger.
+   /// \brief Inserts a line with current time into the log.
    ///
-   /// \param label Description of the current time line.
+   /// \param label Label to be printed to the log together with the current time.
    void writeCurrentTime( const char* label );
 
    // TODO: add units
-   template< typename T >
+   template< typename ParameterType >
    void writeParameter( const String& label,
                         const String& parameterName,
                         const Config::ParameterContainer& parameters,
                         int parameterLevel = 0 );
 
-   template< typename T >
+   template< typename ParameterType >
    void writeParameter( const String& label,
-                        const T& value,
+                        const ParameterType& value,
                         int parameterLevel = 0 );
 
    protected:
diff --git a/src/TNL/Logger_impl.h b/src/TNL/Logger_impl.h
index e502332662a02312e97d80778603333243c2432b..08181070f48b33ca691c93f1ae0b9b7b78a17d97 100644
--- a/src/TNL/Logger_impl.h
+++ b/src/TNL/Logger_impl.h
@@ -15,7 +15,7 @@
 
 namespace TNL {
 
-template< typename T >
+template< typename ParameterType >
 void Logger::writeParameter( const String& label,
                              const String& parameterName,
                              const Config::ParameterContainer& parameters,
@@ -26,16 +26,16 @@ void Logger::writeParameter( const String& label,
    for( i = 0; i < parameterLevel; i ++ )
       stream << " ";
    std::stringstream str;
-   str << parameters.getParameter< T >( parameterName );
+   str << parameters.getParameter< ParameterType >( parameterName );
    stream  << label
            << std::setw( width - label.getLength() - parameterLevel - 3 )
            << str.str() << " |" << std::endl;
 }
 
-template< typename T >
+template< typename ParameterType >
 void Logger :: writeParameter( const String& label,
-                                  const T& value,
-                                  int parameterLevel )
+                               const ParameterType& value,
+                               int parameterLevel )
 {
    stream << "| ";
    int i;
diff --git a/src/TNL/Timer.h b/src/TNL/Timer.h
index 1ccc275378a5de5cfe12a2260487d1ad7cf5bae4..f347c45102baef7a61c90639ab70a53ca7f34165 100644
--- a/src/TNL/Timer.h
+++ b/src/TNL/Timer.h
@@ -54,7 +54,7 @@ class Timer
       void start();
 
       /////
-      /// \brief Returs the elapsed time on given timer.
+      /// \brief Returns the elapsed time on given timer.
       ///
       /// It returns the elapsed time between calling the start() and stop() functions.
       /// Starts counting the real time after the function start() is called and