Update bonus feature description

Update bonus feature description to highlight that they are optional

README.md

@@ -19,8 +19,8 @@ describes each project in enough detail so you can develop it from the ground up
 Each project has the following **features**:
 
 1. A clear and descriptive objective;
-2. A list of _User Stories_ which should be implemented; (these stories act more as a guideline than a forced list of _To-Do's_. Fell free to add your own features if you want);
-3. A list of bonus features that can improve the base project;
+2. A list of _User Stories_ which should be implemented; (these stories act more as a guideline than a forced list of _To-Do's_. Feel free to add your own features if you want);
+3. A list of bonus features that can improve the base project. These are optional and should be attempted only after you have completed the required user stories;
 4. All the necessary resources and useful links;
 
 ## Projects