diff --git a/share/man/man9/sx.9 b/share/man/man9/sx.9
index 51883547265..74d115ede24 100644
--- a/share/man/man9/sx.9
+++ b/share/man/man9/sx.9
@@ -124,6 +124,7 @@ argument to
 specifies a set of optional flags to alter the behavior of
 .Fa sx .
 It contains one or more of the following flags:
+.Bl -tag -width SX_NOWITNESS
 .It Dv SX_DUPOK
 Witness should not log messages about duplicate locks being acquired.
 .It Dv SX_NOWITNESS