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diff --git a/util.h b/util.h
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+/* util.h  -- Various error checking wrappers and utilities.
+ *
+ *  Copyright (C) 2016 Tomasz Kramkowski <tk@the-tk.com>
+ *
+ *  This program 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 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef UTIL_H
+#define UTIL_H
+
+#include <stdbool.h>
+#include <stddef.h>
+
+size_t szadd(size_t a, size_t b);
+size_t szmul(size_t a, size_t b);
+void *xstrmalloc(size_t size);
+char *xstrdup(const char *s);
+void *xmalloc(size_t size);
+void *xrealloc(void *p, size_t size);
+char *xstrcut(const char *s, size_t offt, size_t len);
+int xstrcasecmp(const char *s1, const char *s2);
+
+#endif /* UTIL_H */