diff --git a/src/ol/dom/tilelayerrenderer.js b/src/ol/dom/tilelayerrenderer.js
index 939c75e596..234e3a830f 100644
--- a/src/ol/dom/tilelayerrenderer.js
+++ b/src/ol/dom/tilelayerrenderer.js
@@ -1,3 +1,6 @@
+// FIXME ol.dom.TileLayerRenderer should cope with "not ready" layers
+// FIXME ol.dom.TileLayerRenderer should re-render when layer loads
+
 goog.provide('ol.dom.TileLayerRenderer');
 
 goog.require('goog.dom');