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diff --git a/libcds/src/static_sequence/wt_coder_binary.h b/libcds/src/static_sequence/wt_coder_binary.h
index e784281..2b87854 100644
--- a/libcds/src/static_sequence/wt_coder_binary.h
+++ b/libcds/src/static_sequence/wt_coder_binary.h
@@ -1,3 +1,24 @@
+/* wt_coder_binary.h
+ * Copyright (C) 2008, Francisco Claude, all rights reserved.
+ *
+ * wt_coder_binary definition
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+ 
 
 #ifndef wt_coder_binary_h
 #define wt_coder_binary_h
@@ -6,15 +27,24 @@
 #include <wt_coder.h>
 #include <alphabet_mapper.h>
 
+/** Considers the binary representation of the symbols as the code 
+ * 
+ *  @author Francisco Claude
+ */
 class wt_coder_binary: public wt_coder {
 	public:
+    /** Buils a wt_coder_binary using the sequence of length n and the alphabet_mapper
+     *  to determine the length of the binary codes */
 		wt_coder_binary(uint * seq, uint n, alphabet_mapper * am);
 		virtual ~wt_coder_binary();
 		virtual bool is_set(uint symbol, uint l);
 		virtual bool done(uint symbol, uint l);
     virtual uint size();
+    virtual uint save(FILE *fp);
+    static wt_coder_binary * load(FILE *fp);
 
 	protected:
+    wt_coder_binary();
 		uint h;
 };