diff --git a/src/HTMLRenderer/TmpFiles.cc b/src/HTMLRenderer/TmpFiles.cc
index 2025b03..958ab6f 100644
--- a/src/HTMLRenderer/TmpFiles.cc
+++ b/src/HTMLRenderer/TmpFiles.cc
@@ -1,13 +1,22 @@
+/*
+ * TmpFiles.cc
+ *
+ * Collect and clean-up temporary files
+ *
+ * implemented by WangLu
+ * split off by Filodej <philodej@gmail.com>
+ */
+
+#include <iostream>
 #include "TmpFiles.h"
 #include "Param.h"
-#include <iostream>
 
 using namespace std;
 
 namespace pdf2htmlEX {
 
 
-TmpFiles::TmpFiles( Param const& param_ )
+TmpFiles::TmpFiles( const Param& param_ )
 	: param( param_ )
 {
 }
@@ -17,7 +26,7 @@ TmpFiles::~TmpFiles()
     clean();
 }
 
-void TmpFiles::add(const string & fn)
+void TmpFiles::add( const string & fn)
 {
     if(!param.clean_tmp)
         return;
diff --git a/src/include/TmpFiles.h b/src/include/TmpFiles.h
index 3084585..f036593 100644
--- a/src/include/TmpFiles.h
+++ b/src/include/TmpFiles.h
@@ -10,16 +10,16 @@ namespace pdf2htmlEX {
 class TmpFiles 
 {
 public:
-    explicit TmpFiles( Param const& param );
-    virtual ~TmpFiles();
+    explicit TmpFiles( const Param& param );
+    ~TmpFiles();
 
-	void add(std::string const& fn);
+	void add( const std::string& fn);
 
 private:
 	void clean();
 		
 private:
-    Param const& param;
+    const Param& param;
 	std::set<std::string> tmp_files;
 
 };