diff --git a/ui/shared/src/main/scala/works/iterative/ui/model/Computable.scala b/ui/shared/src/main/scala/works/iterative/ui/model/Computable.scala
index 1c88f98..38c1f32 100644
--- a/ui/shared/src/main/scala/works/iterative/ui/model/Computable.scala
+++ b/ui/shared/src/main/scala/works/iterative/ui/model/Computable.scala
@@ -60,7 +60,7 @@
 
   /** The computation is in progress
     */
-  case class Computing(start: Instant) extends Computable[Nothing]:
+  case class Computing(start: Instant = Instant.now()) extends Computable[Nothing]:
     override def update[B](m: B): Computable[B] = Ready(m)
     override def started: Computable[Nothing] = this
 

diff --git a/ui/shared/src/main/scala/works/iterative/ui/model/Computable.scala b/ui/shared/src/main/scala/works/iterative/ui/model/Computable.scala
index 1c88f98..38c1f32 100644
--- a/ui/shared/src/main/scala/works/iterative/ui/model/Computable.scala
+++ b/ui/shared/src/main/scala/works/iterative/ui/model/Computable.scala
@@ -60,7 +60,7 @@
 
   /** The computation is in progress
     */
-  case class Computing(start: Instant) extends Computable[Nothing]:
+  case class Computing(start: Instant = Instant.now()) extends Computable[Nothing]:
     override def update[B](m: B): Computable[B] = Ready(m)
     override def started: Computable[Nothing] = this
 
diff --git a/ui/shared/src/main/scala/works/iterative/ui/model/HtmlUIBuilder.scala b/ui/shared/src/main/scala/works/iterative/ui/model/HtmlUIBuilder.scala
index 00bb217..76a5ec5 100644
--- a/ui/shared/src/main/scala/works/iterative/ui/model/HtmlUIBuilder.scala
+++ b/ui/shared/src/main/scala/works/iterative/ui/model/HtmlUIBuilder.scala
@@ -14,9 +14,10 @@
       id: Block.Id,
       title: Block.Title,
       subtitle: Block.Subtitle,
+      status: Block.Status,
       actions: Block.Actions,
       content: Block.Content,
-      footer: Block.Footer
+      footer: Block.Footer,
   ) extends UIElement
 
   object Block:
@@ -26,6 +27,7 @@
     type Actions = List[Action]
     type Content = Reader[Any, Output]
     type Footer = Option[Output]
+    type Status = Vector[Output]
 
   trait Interpreter:
     def render(el: UIElement): Rendered