* meta: Run in scan mode again (more intelligently) and re-add support for

[ikiwiki.git] / doc / plugins / write.mdwn

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 34caf83f68e8aa469febccf1031a1dae95896a7f..0da425402fb53b826eab803fb619e3daa8ed97c6 100644 (file)
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -123,7 +123,9 @@ An optional "scan" parameter, if set to a true value, makes the hook be
 called during the preliminary scan that ikiwiki makes of updated pages,
 before begining to render pages. This parameter should be set to true if
 the hook modifies data in `%links`. Note that doing so will make the hook
-be run twice per page build, so avoid doing it for expensive hooks.
+be run twice per page build, so avoid doing it for expensive hooks. (As an
+optimisation, if your preprocessor hook is called in a void contets, you
+can assume it's being run in scan mode.)
 
 Note that if the [[htmlscrubber]] is enabled, html in
 [[ikiwiki/PreProcessorDirective]] output is sanitised, which may limit what