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-rw-r--r--doc/gpgme.texi6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/gpgme.texi b/doc/gpgme.texi
index 4692d263..fe0ade23 100644
--- a/doc/gpgme.texi
+++ b/doc/gpgme.texi
@@ -748,6 +748,12 @@ This specifies the OpenPGP protocol.
@item GPGME_PROTOCOL_CMS
This specifies the Cryptographic Message Syntax.
+
+@item GPGME_PROTOCOL_UNKNOWN
+Reserved for future extension. You may use this to indicate that the
+used protocol is not known to the application. Currently,
+@acronym{GPGME} does not accept this value in any operation, though,
+except for @code{gpgme_get_protocol_name}.
@end table
@end deftp