diff --git a/src/Lachain.Core/Blockchain/Hardfork/HardforkHeights.cs b/src/Lachain.Core/Blockchain/Hardfork/HardforkHeights.cs
index 2621e1c7b..188038285 100644
--- a/src/Lachain.Core/Blockchain/Hardfork/HardforkHeights.cs
+++ b/src/Lachain.Core/Blockchain/Hardfork/HardforkHeights.cs
@@ -104,12 +104,8 @@ public static bool IsHardfork_15Active(ulong height)
             return height >= Hardfork_15;
         }
 
-        public static bool IsHardfork_16Active(ulong height)
-        {
-            return height >= Hardfork_16;
-        }
-        
         // adjust gas consumption
+        // allow contract balance transfer in ExternalHandler.cs
         public static bool IsHardfork_16Active(ulong height)
         {
             return height >= Hardfork_16;