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-rw-r--r--doc/serdi.13
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/serdi.1 b/doc/serdi.1
index 77f1bb1a..6e99693a 100644
--- a/doc/serdi.1
+++ b/doc/serdi.1
@@ -60,7 +60,8 @@ This will normalize statement order, at the cost of performance and memory consu
.TP
.BR \-o " " \fISYNTAX\fR
Write output as \fISYNTAX\fR.
-Valid values (case-insensitive): \*(lqturtle\*(rq, \*(lqntriples\*(rq, \*(lqtrig\*(rq, \*(lqnquads\*(rq.
+Valid values (case-insensitive): \*(lqturtle\*(rq, \*(lqntriples\*(rq, \*(lqtrig\*(rq, \*(lqnquads\*(rq, \*(lqempty\*(rq.
+When \*(lqempty\*(rq is given, output is suppressed, so only errors will be printed.
.TP
.BR \-p " " \fIPREFIX\fR