diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -17,6 +17,10 @@ This is yet another Android library project providing a simple image cropping `A
 
 ## Usage
 
+First, declare `CropImageActivity` in your manifest file:
+
+`<activity android:name="com.soundcloud.android.crop.CropImageActivity" />`
+
 #### Crop
 
 `new Crop(inputUri).output(outputUri).asSquare().start(activity)`
diff --git a/screenshot.png b/screenshot.png
index 16cea41..b676da4 100644
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