Add comments to an expression

If you write a complex expression and intend to reuse it later, you should add comments that explain what the expression does and how its pieces work.

Type // at the beginning of the comment. Any text between // and the end of the line is ignored. For example:
```
  // This is a comment.
```
Type /* at the beginning of the comment and */ at the end of the comment. Any text between /* and */ is ignored. For example:
```
  /*  This is a  
      multiline comment. */
```

AfterEffects

Add comments to an expression

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