diff --git a/example/map-halogen/src/Main.purs b/example/map-halogen/src/Main.purs
index bd8babb..75f5242 100644
--- a/example/map-halogen/src/Main.purs
+++ b/example/map-halogen/src/Main.purs
@@ -66,7 +66,7 @@ ui =
     pure next
   eval (HandleMapUpdate msg next) = do
     case msg of
-      OnChangeViewport vp -> liftEff $ log $ show vp
+      OnViewportChange vp -> liftEff $ log $ show vp
       OnClick info -> liftEff $ log $ show info.lngLat
     pure next
 
diff --git a/example/map-halogen/src/MapComponent.purs b/example/map-halogen/src/MapComponent.purs
index 7a3952f..9d06af8 100644
--- a/example/map-halogen/src/MapComponent.purs
+++ b/example/map-halogen/src/MapComponent.purs
@@ -43,7 +43,7 @@ data MapQuery a
   | HandleMessages Messages a
 
 data MapMessages
-  = OnChangeViewport Viewport
+  = OnViewportChange Viewport
   | OnClick ClickInfo
 
 mapComponent :: forall eff m. MonadAff (dom :: DOM, avar :: AVAR | eff) m => H.Component HH.HTML MapQuery MapProps MapMessages m
@@ -154,8 +154,8 @@ mapClass = R.createClass spec
       pure
         $ R.createFactory MapGL.mapGL
         $ MapGL.mkProps viewport
-          { onChangeViewport: mkEffFn1 $ \newVp -> do
-              launchAff_ $ Bus.write (PublicMsg $ OnChangeViewport newVp) messages
+          { onViewportChange: mkEffFn1 $ \newVp -> do
+              launchAff_ $ Bus.write (PublicMsg $ OnViewportChange newVp) messages
               void $ R.transformState this _{viewport = newVp}
           , onClick: mkEffFn1 $ \info -> do
               launchAff_ $ Bus.write (PublicMsg $ OnClick info) messages
diff --git a/example/map/src/Main.purs b/example/map/src/Main.purs
index 43751fa..9daa173 100644
--- a/example/map/src/Main.purs
+++ b/example/map/src/Main.purs
@@ -36,7 +36,7 @@ mapSpec = R.spec' (const initialViewport) render
     render this = R.readState this <#> \vp ->
       R.createFactory MapGL.mapGL $
         MapGL.mkProps vp
-          { onChangeViewport: mkEffFn1 $ \newVp -> do
+          { onViewportChange: mkEffFn1 $ \newVp -> do
               log $ "Changed Viewport: " <> show newVp
               void $ R.writeState this newVp
           , onClick: mkEffFn1 $ \info -> do
diff --git a/src/MapGL.purs b/src/MapGL.purs
index 2d3004a..eb0b82a 100644
--- a/src/MapGL.purs
+++ b/src/MapGL.purs
@@ -2,7 +2,7 @@ module MapGL
   ( Viewport(..)
   , ViewportR
   , LngLat
-  , OnChangeViewport
+  , OnViewportChange
   , ClickInfo
   , OnClickMap
   , MapProps
@@ -70,7 +70,7 @@ instance showLngLat :: Show LngLat where
   show = genericShow
 
 -- | A handler to be run whenever the viewport changes
-type OnChangeViewport eff = EffFn1 eff Viewport Unit
+type OnViewportChange eff = EffFn1 eff Viewport Unit
 
 -- | The type exposed by the picking engine (abbreviated).
 -- | - `latLng`: The latitude and longitude of the point picked.
@@ -82,7 +82,7 @@ type ClickInfo =
 type OnClickMap eff = EffFn1 eff ClickInfo Unit
 
 type MapPropsR eff r =
-  ( onChangeViewport :: OnChangeViewport eff
+  ( onViewportChange :: OnViewportChange eff
   , onClick :: OnClickMap eff
   , mapStyle :: String
   , mapboxApiAccessToken :: String