diff --git a/man/ttyd.1 b/man/ttyd.1
index 11d9dd749..83ba5f5d3 100644
--- a/man/ttyd.1
+++ b/man/ttyd.1
@@ -78,7 +78,7 @@ Cross platform: macOS, Linux, FreeBSD/OpenBSD, OpenWrt/LEDE, Windows
       Allow client to send command line arguments in URL (eg: http://localhost:7681?arg=foo&arg=bar)
 
 .PP
--R, --writable
+-W, --writable
       Allow clients to write to the TTY (readonly by default)
 
 .PP