fix doc, prefix directives have been default for a while

diff --git a/doc/usage.mdwn b/doc/usage.mdwn
index e411b127a406c9fde7f69c31853bdd7e7050ebdf..55ff17e94a7e8b0912c3de1a34869e02fa68b51e 100644 (file)
--- a/doc/usage.mdwn
+++ b/doc/usage.mdwn
@@ -293,7 +293,7 @@ also be configured using a setup file.
 * --prefix-directives, --no-prefix-directives
 
   Toggle new '!'-prefixed syntax for preprocessor directives.  ikiwiki currently
-  defaults to --no-prefix-directives.
+  defaults to --prefix-directives.
 
 * --w3mmode, --no-w3mmode