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diff --git a/c_src/raid/helper.h b/c_src/raid/helper.h
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+/*
+ * Copyright (C) 2013 Andrea Mazzoleni
+ *
+ * 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.
+ */
+
+#ifndef __RAID_HELPER_H
+#define __RAID_HELPER_H
+
+/**
+ * Inserts an integer in a sorted vector.
+ *
+ * This function can be used to insert indexes in order, ready to be used for
+ * calling raid_rec().
+ *
+ * @n Number of integers currently in the vector.
+ * @v Vector of integers already sorted.
+ *   It must have extra space for the new elemet at the end.
+ * @i Value to insert.
+ */
+void raid_insert(int n, int *v, int i);
+
+/**
+ * Sorts a small vector of integers.
+ *
+ * If you have indexes not in order, you can use this function to sort them
+ * before calling raid_rec().
+ *
+ * @n Number of integers. No more than RAID_PARITY_MAX.
+ * @v Vector of integers.
+ */
+void raid_sort(int n, int *v);
+
+#endif
+