diff --git a/internal/cmd/target.go b/internal/cmd/target.go
index f8369d3..3c2a36a 100644
--- a/internal/cmd/target.go
+++ b/internal/cmd/target.go
@@ -62,7 +62,7 @@ type targetFilter struct {
 	Name      string          `short:"N" help:"Filter targets by job name (regular expression)."`
 	Server    string          `short:"S" help:"Filter targets by promehteus server name (regular expression)."`
 	ScrapeURL string          `short:"u" help:"Filter targets by scrape url (regular expression)."`
-	Health    v1.HealthStatus `short:"H" help:"Filter targets by health (up|down)" enum:"up,down,"`
+	Health    v1.HealthStatus `short:"H" help:"Filter targets by health (up|down)" enum:"up,down,unknown,"`
 	Selector  string          `short:"s" help:"Filter services by (k8s style) selector."`
 }