--- UTC
r226103 | des | 2011-10-07 08:10:16 -0500 (Fri, 07 Oct 2011) | 5 lines

Add a -x option that causes ssh-agent(1) to exit when all clients have
disconnected.

--- ssh-agent.1.orig	2020-02-13 16:40:54.000000000 -0800
+++ ssh-agent.1	2020-03-21 17:03:22.952068000 -0700
@@ -43,7 +43,7 @@
 .Sh SYNOPSIS
 .Nm ssh-agent
 .Op Fl c | s
-.Op Fl \&Dd
+.Op Fl \&Ddx
 .Op Fl a Ar bind_address
 .Op Fl E Ar fingerprint_hash
 .Op Fl P Ar provider_whitelist
@@ -125,6 +125,8 @@ A lifetime specified for an identity with
 .Xr ssh-add 1
 overrides this value.
 Without this option the default maximum lifetime is forever.
+.It Fl x
+Exit after the last client has disconnected.
 .It Ar command Op Ar arg ...
 If a command (and optional arguments) is given,
 this is executed as a subprocess of the agent.