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diff --git a/src/Mapbox/Cmd.elm b/src/Mapbox/Cmd.elm
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+module Mapbox.Cmd exposing (..)
+
+{-| This module has a bunch of essentially imperative commands for your map.
+
+However, since a published library can't have ports in it, you will need to do some setup. The easiest way to do this is to copy paste the following code into your app:
+
+    import Json.Decode exposing (Value)
+    import Mapbox.Cmd as Cmd
+
+    port elmMapboxOutgoing : Value -> Cmd msg
+
+    port elmMapboxIncoming : (Cmd.Response -> msg) -> Sub msg
+
+    mapId =
+        {- this is whatever the `id` attribute on your map is -}
+        "my-map"
+
+    flyTo =
+        Cmd.flyTo elmMapboxOutgoing mapId
+
+-}
+
+import Json.Encode as Encode exposing (Value)
+import Mapbox.Element exposing (LngLat, Viewport)
+
+
+type alias Outgoing msg =
+    Value -> Cmd msg
+
+
+type alias Id =
+    String
+
+
+encodePair encoder ( a, b ) =
+    Encode.list [ encoder a, encoder b ]
+
+
+fitBounds : Outgoing msg -> Id -> ( LngLat, LngLat ) -> Cmd msg
+fitBounds prt id bounds =
+    prt <|
+        Encode.object
+            [ ( "command", Encode.string "fitBounds" )
+            , ( "target", Encode.string id )
+            , ( "bounds", encodePair (encodePair Encode.float) bounds )
+            ]
+
+
+
+--
+--
+-- flyTo : Outgoing msg -> Id -> Viewport -> { curve : Float } -> Cmd msg
+-- flyTo prt id desiredViewport options =
+--     prt <|
+--         Encode.object
+--             [ ( "command", Encode.string "flyTo" )
+--             , ( "target", Encode.string id )
+--             ]