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#### 4.1.3 Comment Indentation

In IDL, lines starting with a ‘`;`’ are called comment lines. Comment lines are indented as follows:

`;;;` | The indentation of lines starting with three semicolons remains unchanged.
`;;` | Lines starting with two semicolons are indented like the surrounding code.
`;` | Lines starting with a single semicolon are indented to a minimum column.

The indentation of comments starting in column 0 is never changed.

— User Option: idlwave-no-change-comment

> The indentation of a comment starting with this regexp will not be changed.

— User Option: idlwave-begin-line-comment

> A comment anchored at the beginning of line.

— User Option: idlwave-code-comment

> A comment that starts with this regexp is indented as if it is a part of IDL code.