diff --git a/misc-utils/lsfd.1.adoc b/misc-utils/lsfd.1.adoc
index 02e34e7b574..1f7e889d46c 100644
--- a/misc-utils/lsfd.1.adoc
+++ b/misc-utils/lsfd.1.adoc
@@ -189,7 +189,10 @@ eventfd type:::
 _PID_,_COMMAND_,_ASSOC_
 
 UNIX-STREAM:::
-_PID_,_COMMAND_,_ASSOC_
+_PID_,_COMMAND_,_ASSOC_[-r?][-w?]
++
+About the last characters ([-r?][-w?]), see the description
+of _SOCK.SHUTDOWN_.
 
 EVENTFD.ID <``number``>::
 Eventfd ID.