README.md in snapshot-0.4.6 vs README.md in snapshot-0.4.7

@@ -274,9 +274,18 @@
 
 ```
 SNAPSHOT_APP_IDENTIFIER="com.krausefx.app" snapshot
 ```
 
+### Clear old screenshots
+
+If you add this line in your `Snapfile`, the previously generated screenshots will be deleted before generating new ones:
+
+```ruby
+clear_previous_screenshots
+```
+
+
 # Tips
 
 ## [`fastlane`](http://fastlane.tools) Toolchain
 
 - [`fastlane`](http://fastlane.tools): Connect all deployment tools into one streamlined workflow