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-rw-r--r--doc/doc-docbook/spec.xfpt10
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 8afccbf1d..9c39b4aa2 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -11824,6 +11824,16 @@ command in a filter file. Its use is explained in the description of that
command, which can be found in the separate document entitled &'Exim's
interfaces to mail filtering'&.
+.new
+.vitem &$tls_bits$&
+.vindex "&$tls_bits$&"
+Contains an approximation of the TLS cipher's bit-strength; the meaning of
+this depends upon the TLS implementation used.
+If TLS has not been negotiated, the value will be 0.
+The value of this is automatically fed into the Cyrus SASL authenticator
+when acting as a server, to specify the "external SSF" (a SASL term).
+.wen
+
.vitem &$tls_certificate_verified$&
.vindex "&$tls_certificate_verified$&"
This variable is set to &"1"& if a TLS certificate was verified when the