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-rw-r--r--doc/doc-docbook/spec.xfpt10
1 files changed, 9 insertions, 1 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 5acdce0a6..118b7b566 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -17836,7 +17836,15 @@ 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
+.new
+The file(s) should be in DER format,
+except for GnuTLS 3.6.3 or later when an optional filetype prefix
+can be used. The prefix must be one of "DER" or "PEM", followed by
+a single space. If one is used it sets the format for subsequent
+files in the list; the initial format is DER.
+When a PEM format file is used it may contain multiple proofs,
+for multiple certificate chain element proofs under TLS1.3.
+.wen
.option tls_on_connect_ports main "string list" unset
.cindex SSMTP