Update README.md

README.md

@@ -51,7 +51,7 @@ guide the learner’s interaction with the component.
 
 >**attribution** (string): Optional text to be displayed as an [attribution](https://wiki.creativecommons.org/Best_practices_for_attribution). By default it is displayed below the image. Adjust positioning by modifying CSS. Text can contain HTML tags, e.g., `Copyright © 2015 by <b>Lukasz 'Severiaan' Grela</b>`  
 
-## Notes
+### Notes
 If you don't need this component to display a different image for large/small screen sizes, you can use **src** (instead of **large** and **small**) to specify an image that will be displayed for all screen sizes.  
 
 ## Accessibility