diff --git a/core/vm/opcodes.go b/core/vm/opcodes.go
index c5ef605529..19252b01f2 100644
--- a/core/vm/opcodes.go
+++ b/core/vm/opcodes.go
@@ -64,7 +64,10 @@ const (
 	SHL    OpCode = 0x1b
 	SHR    OpCode = 0x1c
 	SAR    OpCode = 0x1d
+)
 
+// 0x20 range - crypto.
+const (
 	KECCAK256 OpCode = 0x20
 )