diff --git a/README.md b/README.md
index b807e25..73201e5 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,8 @@
 clusterlayer-plugin-ios
 =======================
 
-A cluster layer extension to the ArcGIS Runtime for iOS.
+A cluster layer extension to the [ArcGIS Runtime for iOS](https://developers.arcgis.com/ios/).
+
+The gridding code is based heavily on [Leaflet.markercluster](https://github.com/Leaflet/Leaflet.markercluster/blob/master/src/DistanceGrid.js)
+
+![App](clusterlayer-ios.png)
\ No newline at end of file
diff --git a/Source/AGSClusterLayer/AGSClusterLayer.m b/Source/AGSClusterLayer/AGSClusterLayer.m
index 67d85e5..a4f3ce3 100644
--- a/Source/AGSClusterLayer/AGSClusterLayer.m
+++ b/Source/AGSClusterLayer/AGSClusterLayer.m
@@ -120,7 +120,6 @@ -(void)rebuildClusterGrid {
     for (id<AGSFeature> feature in self.featureLayer.graphics) {
         [self.grid addFeature:feature];
     }
-    NSLog(@"Clusters built: %@", self.grid);
 }
 
 -(void) renderClusters {
diff --git a/Source/AGSClusterLayer/AGSClusterLayerRenderer.h b/Source/AGSClusterLayer/AGSClusterLayerRenderer.h
index 3d3eb2a..4473d27 100644
--- a/Source/AGSClusterLayer/AGSClusterLayerRenderer.h
+++ b/Source/AGSClusterLayer/AGSClusterLayerRenderer.h
@@ -7,8 +7,11 @@
 //
 
 #import <ArcGIS/ArcGIS.h>
-@class AGSClusterLayer;
+#import "AGSCluster.h"
+
+typedef AGSSymbol*(^SymbolGeneratorBlock)(AGSCluster *);
 
 @interface AGSClusterLayerRenderer : AGSSimpleRenderer
 -(id)initAsSurrogateFor:(AGSRenderer *)originalRenderer;
+-(id)initAsSurrogateFor:(AGSRenderer *)originalRenderer clusterSymbolBlock:(SymbolGeneratorBlock)clusterSymbolGenerator coverageSymbolBlock:(SymbolGeneratorBlock)coverageSymbolGenerator;
 @end
\ No newline at end of file
diff --git a/Source/AGSClusterLayer/AGSClusterLayerRenderer.m b/Source/AGSClusterLayer/AGSClusterLayerRenderer.m
index 3170492..ed7ca18 100644
--- a/Source/AGSClusterLayer/AGSClusterLayerRenderer.m
+++ b/Source/AGSClusterLayer/AGSClusterLayerRenderer.m
@@ -8,12 +8,9 @@
 
 #import "AGSClusterLayerRenderer.h"
 #import <objc/runtime.h>
-#import "AGSCluster.h"
 
 #define kClusterPayloadKey @"__cluster"
 
-typedef AGSSymbol*(^SymbolGeneratorBlock)(AGSCluster *);
-
 @interface AGSClusterLayerRenderer ()
 @property (nonatomic, weak) AGSRenderer *originalRenderer;
 @property (nonatomic, copy) SymbolGeneratorBlock clusterGenBlock;
diff --git a/clusterlayer-ios.png b/clusterlayer-ios.png
new file mode 100644
index 0000000..bc3ad2a
Binary files /dev/null and b/clusterlayer-ios.png differ