* Instead of returning an empty string array or empty uid array, we
* may return NULL.
*
- * Free the data we return with libc free().
+ * Free the data the library returns with libc free(). String arrays
+ * are NULL terminated and you need to free the array itself in
+ * addition to the strings contained.
*
* We return error codes as negative errno, kernel-style. 0 or
* positive on success.