To link to an anchor inside a page, you can use something like
`\[[WikiLink#foo]]`
-**Note that you cannot use spaces in WikiLinks**. Replace spaces with
-underscores. The presence of spaces is used to distinguish between a
-[[PreprocessorDirective]] and a WikiLink.
+## Preprocessor directives and wikilinks
+
+ikiwiki has two syntaxes for
+[[preprocessor_directives|PreprocessorDirective]]. The older syntax
+used spaces to distinguish between preprocessor directives and
+wikilinks; as a result, with that syntax in use, you cannot use spaces
+in WikiLinks, and must replace spaces with underscores. The newer
+syntax, enabled with the `prefix_directives` option in an ikiwiki
+setup file, prefixes directives with `!`, and thus does not prevent
+links with spaces. Future versions of ikiwiki will turn this option
+on by default.
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