usefulness comment
diff --git a/skeletons/OBJECT_IDENTIFIER.h b/skeletons/OBJECT_IDENTIFIER.h
index b1d4055..b1eb267 100644
--- a/skeletons/OBJECT_IDENTIFIER.h
+++ b/skeletons/OBJECT_IDENTIFIER.h
@@ -113,6 +113,7 @@
*
* WARNING: The function always returns the real number of arcs,
* even if there is no sufficient (_arc_slots) provided.
+ * This is useful for (_arc_slots) value estimation.
*/
int OBJECT_IDENTIFIER_parse_arcs(const char *oid_text, ssize_t oid_txt_length,
long arcs[], unsigned int arcs_slots, char **oid_text_end);