diff --git a/pkg/consts/spd.go b/pkg/consts/spd.go
index f016fea4..23f57758 100644
--- a/pkg/consts/spd.go
+++ b/pkg/consts/spd.go
@@ -39,6 +39,9 @@ const (
 	SPDAnnotationBaselineSentinelKey         = "spd.katalyst.kubewharf.io/baselineSentinel"
 	SPDAnnotationExtendedBaselineSentinelKey = "spd.katalyst.kubewharf.io/extendedBaselineSentinel"
 
+	// SPDAnnotationKeyCustomCompareKey holds annotation for spd baseline compare key
+	SPDAnnotationKeyCustomCompareKey = "spd.katalyst.kubewharf.io/customCompareKey"
+
 	SPDBaselinePercentMax = 100
 	SPDBaselinePercentMin = 0
 )