diff --git a/src/csvparser.h b/src/csvparser.h
new file mode 100644
index 0000000..e48967b
--- /dev/null
+++ b/src/csvparser.h
@@ -0,0 +1,27 @@
+/*
+	csvparser.h - function declarations
+
+	This file is part of libcsvparser.
+
+	libcsvparser 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 3 of the License, or (at your
+	option) any later version.
+
+	libcsvparser 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 mp3fw. If not, see <https://www.gnu.org/licenses/>. 
+*/
+
+#ifndef CSVPARSER_H_
+#define CSVPARSER_H_
+
+#define MAXCHAR 1000
+
+int parse_tokens(char *file);
+
+#endif
diff --git a/src/libcsvparser.c b/src/libcsvparser.c
index ed1ca47..2474166 100644
--- a/src/libcsvparser.c
+++ b/src/libcsvparser.c
@@ -1,24 +1,44 @@
 /*
-	libcsvparser.c - simple CSV parser
- */
+	libcsvparer.c - csv parsing library
+
+	This file is part of libcsvparser.
+
+	libcsvparser 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 3 of the License, or (at your
+	option) any later version.
+
+	libcsvparser 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 mp3fw. If not, see <https://www.gnu.org/licenses/>. 
+*/
 
 #include <stdio.h>
 #include <string.h>
 #include <stdbool.h>
 
+#include "csvparser.h"
+
 #define MAXCHAR 1000
 
 int
 parse_tokens(char *file)
 {
+
+	int return_value;
+
 	FILE *fp;
 	char row[MAXCHAR];
 	char *token;
 
 	fp = fopen(file, "r");
 	if (fp == NULL) {
-		printf("csv file %s not found\n", file);
-		return 1;
+		return_value = 1;
+		return return_value;
 	}
 
 	while (feof(fp) != true) {
@@ -31,5 +51,6 @@ parse_tokens(char *file)
 		}
 	}
 
-	return 0;
+	return_value = 0;
+	return return_value;
 }