[PR #45] Added note to README about storing a strong ref to image dow…

…nloaders.
Alamofire · Oct 28, 2015 · f664428 · f664428
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commit f664428
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diff --git a/README.md b/README.md
@@ -348,6 +348,8 @@ downloader.downloadImage(URLRequest: URLRequest) { response in
 }
 ```
 
+> Make sure to keep a strong reference to the `ImageDownloader` instance, otherwise the `completion` closure will not be called because the `downloader` reference will go out of scope before the `completion` closure can be called.
+
 #### Applying an ImageFilter
 
 ```swift