diff --git a/S32-setting-library/Containers.pod b/S32-setting-library/Containers.pod
index 6edcb21c2..c7e79a553 100644
--- a/S32-setting-library/Containers.pod
+++ b/S32-setting-library/Containers.pod
@@ -681,6 +681,16 @@ are converted to a list of individual values before permuting them.)
 
 The functional form assumes it is working on a list of integers C<^$n>.
 
+=item rotor
+
+    multi method rotor ( $elems = 2, $overlap = 1 )
+
+Returns a new list of sublists formed by returning a sublist of C<$elems>
+elements, backing up by C<$overlap> elements, then repeating.  Stops as
+soon as there are no longer enough remaining elements to form a sublist
+that is C<$elems> long.  (From which it follows that an infinite list
+can be rotorized forever.)
+
 =item pairup
 
  multi method pairup ( )