1 files changed, 5 insertions, 1 deletions
diff --git a/tmux.1 b/tmux.1
index faa129a0..41e76c93 100644
--- a/tmux.1
+++ b/tmux.1
@@ -1996,7 +1996,7 @@ abc123
 Commands which set options are as follows:
 .Bl -tag -width Ds
 .It Xo Ic set-option
-.Op Fl agqsuw
+.Op Fl agoqsuw
 .Op Fl t Ar target-session | Ar target-window
 .Ar option Ar value
 .Xc
@@ -2025,6 +2025,10 @@ options.
 It is not possible to unset a global option.
 .Pp
 The
+.Fl o
+flag prevents setting an option that is already set.
+.Pp
+The
 .Fl q
 flag suppresses the informational message (as if the
 .Ic quiet