diff --git a/util.c b/util.c
index 99d4c9b..2acd726 100644
--- a/util.c
+++ b/util.c
@@ -1,4 +1,23 @@
+/* This file is part of libbrandt.
+ * Copyright (C) 2016 GNUnet e.V.
+ *
+ * libbrandt is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libbrandt 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * libbrandt.  If not, see <http://www.gnu.org/licenses/>.
+ */
 
+/**
+ * @file util.c
+ * @brief TODO
+ */
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -6,42 +25,63 @@
 
 #include "util.h"
 
-static void xvprintf(const char *, va_list);
+static void xvprintf (const char *, va_list);
 
+/**
+ * eprintf
+ *
+ * @param fmt TODO
+ * @param
+ */
 void
-eprintf(const char *fmt, ...)
+eprintf (const char *fmt, ...)
 {
 	va_list ap;
 
-	va_start(ap, fmt);
-	xvprintf(fmt, ap);
-	va_end(ap);
+	va_start (ap, fmt);
+	xvprintf (fmt, ap);
+	va_end (ap);
 
-	abort();
+	abort ();
 }
 
+/**
+ * weprintf
+ *
+ * @param fmt TODO
+ * @param
+ */
 void
-weprintf(const char *fmt, ...)
+weprintf (const char *fmt, ...)
 {
 	va_list ap;
 
-	va_start(ap, fmt);
-	xvprintf(fmt, ap);
-	va_end(ap);
+	va_start (ap, fmt);
+	xvprintf (fmt, ap);
+	va_end (ap);
 }
 
+/**
+ * xvprintf
+ *
+ * @param fmt TODO
+ * @param ap TODO
+ */
 void
-xvprintf(const char *fmt, va_list ap)
+xvprintf (const char *fmt, va_list ap)
 {
 	/**TODO: provide other logging target than stderr */
-	fputs("libbrandt: ", stderr);
+	fputs ("libbrandt: ", stderr);
 
-	vfprintf(stderr, fmt, ap);
+	vfprintf (stderr, fmt, ap);
 
-	if (fmt[0] && fmt[strlen(fmt)-1] == ':') {
-		fputc(' ', stderr);
-		perror(NULL);
-	} else {
-		fputc('\n', stderr);
+	if (fmt[0] && fmt[strlen (fmt) - 1] == ':')
+	{
+		fputc (' ', stderr);
+		perror (NULL);
+	}
+	else
+	{
+		fputc ('\n', stderr);
 	}
 }