diff --git a/CachedImageExample/index.js b/CachedImageExample/index.js
index 5f00306..154c91e 100644
--- a/CachedImageExample/index.js
+++ b/CachedImageExample/index.js
@@ -159,7 +159,8 @@ class CachedImageExample extends React.Component {
                 <ImageCacheProvider
                     urlsToPreload={images}
                     onPreloadComplete={() => ReactNative.Alert.alert('onPreloadComplete')}
-                    ttl={60}>
+                    ttl={60}
+                    numberOfConcurrentPreloads={0}>
                     <ListView
                         dataSource={this.state.dataSource}
                         renderRow={this.renderRow}
diff --git a/ImageCachePreloader.js b/ImageCachePreloader.js
index 32da07c..9fb8633 100644
--- a/ImageCachePreloader.js
+++ b/ImageCachePreloader.js
@@ -16,9 +16,13 @@ function runPreloadTask(prefetcher, imageCacheManager) {
     if (!url) {
         return Promise.resolve();
     }
+    // console.log('START', url);
     return imageCacheManager.downloadAndCacheUrl(url)
         // allow prefetch task to fail without terminating other prefetch tasks
         .catch(_.noop)
+        // .then(() => {
+        //     console.log('END', url);
+        // })
         // then run next task
         .then(() => runPreloadTask(prefetcher, imageCacheManager));
 }