<p>This argument is followed by a header name, which can
include the final colon, but it is not required. Case is
ignored. For <code>add</code>, <code>append</code> and
- <code>set</code> a value is given as the third argument. If
- this value contains spaces, it should be surrounded by double
- quotes. For unset, no value should be given.</p>
+ <code>set</code> a <em>value</em> is given as the third argument. If
+ <em>value</em> contains spaces, it should be surrounded by double
+ quotes. For unset, no <em>value</em> should be given.</p>
<p>The <directive>RequestHeader</directive> directive is processed
just before the request is run by its handler in the fixup phase.