diff --git a/core/tracing/hooks.go b/core/tracing/hooks.go
index 3b69359f98..51bac8e7a6 100644
--- a/core/tracing/hooks.go
+++ b/core/tracing/hooks.go
@@ -298,6 +298,7 @@ const (
 	BalanceDecreaseSelfdestructBurn BalanceChangeReason = 14
 
 	// BalanceChangeRevert is emitted when the balance is reverted back to a previous value due to call failure.
+	// It is only emitted when the tracer has opted in to use the journaling wrapper.
 	BalanceChangeRevert BalanceChangeReason = 15
 )