Docs: add to A= log-line element description

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 4d40bcfea6d31d3e7f549cb17a70cbc8d6ea3d31..2734a5d8d1085cf4713f5dd234e0ea1e7920810d 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -38090,7 +38090,8 @@ fields record the router and transport that were used to process the address.
 If SMTP AUTH was used for the delivery there is an additional item A=
 followed by the name of the authenticator that was used.
 If an authenticated identification was set up by the authenticator's &%client_set_id%&
-option, this is logged too, separated by a colon from the authenticator name.
+option, this is logged too, as a second colon-separated list item.
+Optionally (see the &%smtp_mailauth%& &%log_selector%&) there may be a third list item.
 
 If a shadow transport was run after a successful local delivery, the log line
 for the successful delivery has an item added on the end, of the form