diff --git a/src/move/research/red_black_map/sources/red_black_map.move b/src/move/research/red_black_map/sources/red_black_map.move
index 3771848..2df1185 100644
--- a/src/move/research/red_black_map/sources/red_black_map.move
+++ b/src/move/research/red_black_map/sources/red_black_map.move
@@ -47,14 +47,9 @@ module econia::red_black_map {
         Map { root: Pointer::Null, nodes: vector::empty() }
     }
 
-    /*
-        public fun contains<V>(self: &Map<V>, key: u256): bool {
-            match (self.search(key)) {
-                Found { node: _, side_as_child: _ } => true,
-                NotFound { prospective_parent: _, prospective_side_as_child: _ } => false
-            }
-        }
-    */
+    public fun contains<V: drop>(self: &Map<V>, key: u256): bool {
+        if (self.search(key) is SearchResult::Found) true else false
+    }
 
     public fun insert<V: drop>(self: &mut Map<V>, key: u256, value: V) {
         match(self.root) {