1 files changed, 2 insertions, 0 deletions
diff --git a/tree.sig b/tree.sig
index 8967f83..30cf52a 100644
--- a/tree.sig
+++ b/tree.sig
@@ -14,5 +14,7 @@ signature TREE = sig
         ('v option -> 'a * 'v option) -> 'a * ('k, 'v) t
 
   val print: ('k, 'v) t -> ('k -> string) -> ('v -> string) -> unit
+  val traverse: ('k, 'v) t -> ('k -> 'v -> 'a -> 'a) -> 'a -> 'a
+  val changeV: ('k, 'v) t -> ('v -> 'v) -> ('k, 'v) t
   val size: ('k, 'v) t -> int
 end