diff --git a/extra/newfx/newfx.factor b/extra/newfx/newfx.factor
index be30dfe370..0504744240 100644
--- a/extra/newfx/newfx.factor
+++ b/extra/newfx/newfx.factor
@@ -189,4 +189,9 @@ METHOD: as-mutate { object object assoc }       set-at ;
 
 ! A note about the 'mutate' qualifier. Other words also technically mutate
 ! their primary object. However, the 'mutate' qualifier is supposed to
-! indicate that this is the main objective of the word, as a side effect.
\ No newline at end of file
+! indicate that this is the main objective of the word, as a side effect.
+
+: adjoin      ( seq elt -- seq ) over sets:adjoin ;
+: adjoin-on   ( elt seq -- seq )      sets:adjoin ;
+: adjoined    ( set elt -- set ) swap sets:adjoin ;
+: adjoined-on ( elt set --     )      sets:adjoin ;
\ No newline at end of file