diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b83a390..a15e8c3 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -27,7 +27,7 @@ Then, run:
 
 ```
 $ pip install -U setuptools
-$ pip install -r requirements-test.txt
+$ pip install -r requirements-dev.txt
 $ pip install -e .
 ```
 
diff --git a/README.md b/README.md
index 4ff8147..4f7ed00 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ cropper = Cropper()
 cropped_array = cropper.crop('portrait.png')
 
 # Save the cropped image with PIL if a face was detected:
-if cropped_array:
+if cropped_array is not None:
     cropped_image = Image.fromarray(cropped_array)
     cropped_image.save('cropped.png')
 ~~~