Syntax for Adding Comments to Code Injection Window?

Is there a way to add comments to the Site Header and Site Footer fields for Code Injection, so that I can try to keep straight the purpose of this stuff I’m adding? If yes, what’s the syntax?

The syntax is the same as in HTML and will vary depending on the context, eg:

<!-- html comment -->

/* CSS comment */
.comment { }

// JavaScript comment
function comment() {}
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