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-rw-r--r--doc/guix.texi4
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diff --git a/doc/guix.texi b/doc/guix.texi
index c9505f41d7..b2eed51bd0 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -18020,6 +18020,10 @@ Udev extensions are composed into a list of rules, but the udev service
 value is itself a @code{<udev-configuration>} record.  So here, we
 extend that record by appending the list of rules it contains to the
 list of contributed rules.
+
+@item description
+This is a string giving an overview of the service type.  The string can
+contain Texinfo markup (@pxref{Overview,,, texinfo, GNU Texinfo}).
 @end table
 
 There can be only one instance of an extensible service type such as