diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 965a977..98e9a10 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -665,6 +665,7 @@
 	count()			count number of times a value appears in a List
 	repeat()		repeat a List multiple times
 	flatten()		flatten a List
+	flattennew()		flatten a copy of a List
 
 Dictionary manipulation:				*dict-functions*
 	get()			get an entry without an error for a wrong key