diff --git a/pkg/cmd/clustertask/describe.go b/pkg/cmd/clustertask/describe.go
index a914c5728..6f3a4c330 100644
--- a/pkg/cmd/clustertask/describe.go
+++ b/pkg/cmd/clustertask/describe.go
@@ -138,7 +138,7 @@ or
 		},
 	}
 
-	_ = c.MarkZshCompPositionalArgumentCustom(1, "__tkn_get_clustertask")
+	_ = c.MarkZshCompPositionalArgumentCustom(1, "__tkn_get_clustertasks")
 	f.AddFlags(c)
 	return c
 }