use double dash options like in the manual page

diff --git a/doc/setup.mdwn b/doc/setup.mdwn
index 0350aead3c421ffac9339af51dadda20493c6359..4c61700ed2a5f5819afb78760e8cd65e52060cb2 100644 (file)
--- a/doc/setup.mdwn
+++ b/doc/setup.mdwn
@@ -107,7 +107,7 @@ After making changes to this file, you need to tell ikiwiki to use it:
 
 Alternatively, you can ask ikiwiki to change settings in the file for you:
 
-       % ikiwiki --changesetup foo.setup -plugin goodstuff
+       % ikiwiki --changesetup foo.setup --plugin goodstuff
 
 See [[usage]] for more options.