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-rw-r--r--doc/doc-docbook/spec.xfpt1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index f7e930c08..e4dfb98f9 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -17820,6 +17820,7 @@ For GnuTLS 3.5.6 or later the expanded value of this option can be a list
of files, to match a list given for the &%tls_certificate%& option.
The ordering of the two lists must match.
+The file(s) should be in DER format
.option tls_on_connect_ports main "string list" unset
.cindex SSMTP