diff --git a/os2.rkt b/os2.rkt
index cb3cf17..bcdacbd 100644
--- a/os2.rkt
+++ b/os2.rkt
@@ -62,6 +62,7 @@
 	 wild
 	 wild?
 	 non-wild?
+	 ground?
 
 	 ;; Reexports from racket/match for convenience
 	 (all-from-out racket/match)