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-rw-r--r--doc/doc-docbook/spec.xfpt4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 7f96768f7..f7cc50534 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -29861,8 +29861,10 @@ nothing more to it. Choosing a sensible value not derived insecurely is the
only point of caution. The &$tls_out_sni$& variable will be set to this string
for the lifetime of the client connection (including during authentication).
+.new
If DANE validated the connection attempt then the value of the &%tls_sni%& option
-is forced to the domain part of the recipient address.
+is forced to the name of the destination host, after any MX- or CNAME-folowing.
+.wen
Except during SMTP client sessions, if &$tls_in_sni$& is set then it is a string
received from a client.