diff --git a/core/interface.go b/core/interface.go
index d9bee15..1a49c54 100644
--- a/core/interface.go
+++ b/core/interface.go
@@ -66,6 +66,8 @@ type TracerResult interface {
 	CaptureState(pc uint64, op OpCode, gas, cost uint64, scope ScopeContext, rData []byte, depth int, err error)
 	CaptureFault(pc uint64, op OpCode, gas, cost uint64, scope ScopeContext, depth int, err error)
 	CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error)
+	CaptureEnter(typ OpCode, from Address, to Address, input []byte, gas uint64, value *big.Int)
+	CaptureExit(output []byte, gasUsed uint64, err error)
 	Result() (interface{}, error)
 }