diff --git a/features/feature.go b/features/feature.go
index b6987d20e..b3a047b99 100644
--- a/features/feature.go
+++ b/features/feature.go
@@ -16,6 +16,8 @@ func PrintDeprecatedFeatureWarning(feature string) {
 	newError("You are using a deprecated feature: " + feature + ". Please update your config file with latest configuration format, or update your client software.").WriteToLog()
 }
 
+// TaggedFeatures unstable
 type TaggedFeatures interface {
 	GetFeaturesByTag(tag string) (Feature, error)
+	common.Runnable
 }