# Hypertext Help with LaTeX
\addtolength

`\addtolength{len-cmd}{len}`

The `\addtolength` command increments a length command, `len-cmd`, which is specified by the first argument, by the amount specified in the `len` argument. It can be a negative amount.

As an example,

      \addtolength{\parskip}{-.1\parskip}

decreases the value of `\parskip` by 10%.

See Lengths
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