diff --git a/class.rkt b/class.rkt
index fa51878..4f38dce 100644
--- a/class.rkt
+++ b/class.rkt
@@ -39,6 +39,9 @@
     (define/public (exists? key)
       (ks-exists? ksh key))
 
+    (define/public (count)
+      (ks-key-count ksh))
+
     (define/public (glob gl)
       (ks-keys-glob ksh gl))