diff --git a/book/extension_exercises/016.md b/book/extension_exercises/016.md
index 52aa855..bfbbf05 100644
--- a/book/extension_exercises/016.md
+++ b/book/extension_exercises/016.md
@@ -40,7 +40,6 @@ You can control how and when images are inverted by adjusting parameters in `_co
    If `inverter_all: false`, only this image will be inverted.
    ```
 
-
 4. The saturation can also be adjusted. The default colour saturation is `1.5`. Let us reduce the contrast by changing this to `1.0`:
 
    ```yaml