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-rw-r--r--doc/usage.mdwn5
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diff --git a/doc/usage.mdwn b/doc/usage.mdwn
index 2b104bcdb..473d1c9b1 100644
--- a/doc/usage.mdwn
+++ b/doc/usage.mdwn
@@ -62,6 +62,11 @@ These options control the mode that ikiwiki operates in.
If you only want to build any changed pages, you can use --refresh with
--setup.
+* --dumpsetup configfile
+
+ Causes ikiwiki to write to the specified config file, dumping out
+ its current configuration.
+
* --wrappers
If used with --setup --refresh, this makes it also update any configured