2.12.md minor updates

notes/2.12.md

@@ -67,6 +67,7 @@ services. Tile requests that become useless can be aborted.
 
 Image tiles expose an `getCanvasContext` function that can be used for various
 things, like changing the image pixels, save the image using the File API, etc.
+
 See the [osm-grayscale
 example](http://openlayers.org/dev/examples/osm-grayscale.html).
 
@@ -75,6 +76,16 @@ example](http://openlayers.org/dev/examples/osm-grayscale.html).
 The backbuffer code (behind `transitionEffect:resize`) has been redesigned and
 rewritten. This overhaul yields better performance and code simplifications.
 
+## Continous zooming
+
+Tile layers can now be displayed at resolutions not supported by their tiling
+services. This works by requesting tiles at higher resolutions and stretching
+the layer div as appropriate. With this change fractionalZoom:true will work
+for single tile layers as well as for tiled layers.
+
+See the [client zoom
+example](http://openlayers.org/dev/examples/clientzoom.html).
+
 # Behavior Changes from Past Releases
 
 ## GPX API change