diff --git a/sys/man/4/rio b/sys/man/4/rio
index efab905f9..b0997bbef 100644
--- a/sys/man/4/rio
+++ b/sys/man/4/rio
@@ -249,6 +249,8 @@ The commands are
 (restore a hidden window),
 .B current
 (make the window the recipient of keyboard and mouse input),
+.B delete
+(close the window and terminate its associated processes)
 and
 .B new
 (make a new window).