diff --git a/params/protocol_params.go b/params/protocol_params.go
index c8b6609afb..14750f6a1a 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -52,7 +52,7 @@ const (
 	NetSstoreResetRefund      uint64 = 4800  // Once per SSTORE operation for resetting to the original non-zero value
 	NetSstoreResetClearRefund uint64 = 19800 // Once per SSTORE operation for resetting to the original zero value
 
-	JumpdestGas      uint64 = 1     // Refunded gas, once per SSTORE operation if the zeroness changes to zero.
+	JumpdestGas      uint64 = 1     // Once per JUMPDEST operation.
 	EpochDuration    uint64 = 30000 // Duration between proof-of-work epochs.
 	CallGas          uint64 = 40    // Once per CALL operation & message call transaction.
 	CreateDataGas    uint64 = 200   //