diff --git a/doc/fping.8 b/doc/fping.8
index a810b89..bba349a 100644
--- a/doc/fping.8
+++ b/doc/fping.8
@@ -141,7 +141,7 @@ multiplied by the backoff factor.
 Ignored (for compatibility with fping 2.4).
 .IP \fB\-u\fR 5
 Show targets that are unreachable.
-.IP \fB\-T\fIn\fR 5
+.IP \fB\-O\fIn\fR 5
 Set the typ of service flag (TOS). \fIn\fR can be either decimal or hexadecimal (0xh) format.
 .IP \fB\-v\fR 5
 Print