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diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 3976f9adf..668f8d8b6 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -496,6 +496,13 @@ describes the plugin as a whole. For example:
and undef if a rebuild could be needed in some circumstances, but is not
strictly required.
+### genwrapper
+
+ hook(type => "genwrapper", id => "foo", call => \&genwrapper);
+
+This hook is used to inject C code (which it returns) into the `main`
+function of the ikiwiki wrapper when it is being generated.
+
## Plugin interface
To import the ikiwiki plugin interface: