diff --git a/src/Component/CatalogGrid.hs b/src/Component/CatalogGrid.hs
index 3fc6b1d..768c117 100644
--- a/src/Component/CatalogGrid.hs
+++ b/src/Component/CatalogGrid.hs
@@ -6,6 +6,7 @@ module Component.CatalogGrid
 , Action
 , Interface (..)
 , view
+, update
 ) where
 
 import Miso
@@ -23,6 +24,8 @@ import Miso
     , p_
     , br_
     , id_
+    , Effect
+    , noEff
     )
 
 type Model = ()
@@ -37,13 +40,20 @@ data Interface a = Interface
     , selectThread :: ()
     }
 
+update
+    :: Interface a
+    -> Action
+    -> Model
+    -> Effect a Model
+update = const $ const noEff
+
 view :: Interface a -> Model -> View a
 view iface model =
     div_
         [ class_ "threads" ]
         [ div_
             [ id_ "Grid" ]
-            [ gridItem | _ <- [0..10] ]
+            [ gridItem | _ <- [0..10] :: [ Int ] ]
         ]
 
 gridItem :: View a
diff --git a/src/Main.hs b/src/Main.hs
index 1947c46..b229376 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -73,8 +73,15 @@ mainView model =
         , Grid.view iGrid (gridModel model)
         ]
 
+
 mainUpdate :: Action -> Model -> Effect Action Model
-mainUpdate = const noEff
+mainUpdate NoAction m = noEff m
+mainUpdate GetLatest m = noEff m
+mainUpdate GetThread {..} m = noEff m
+mainUpdate (GridAction ga) m =
+    Grid.update iGrid ga (gridModel m)
+    >>= \gm -> noEff (m { gridModel = gm })
+
 
 iGrid :: Grid.Interface Action
 iGrid = Grid.Interface