The instruction is speaking about readability. You will see the example has an unordered list ul and each li child element is indented by 2 spaces, to make it easier to read for the programmer. Remove the ul element, it is only an example for you to consider the application of indentation. Your code so far is all in one line, without any indentation. SO you need to add 2 spaces to your children H2, the comment, and p element in your parent element (main).