Update README.md

Author: rupor-github

README.md

@@ -20,6 +20,12 @@ You *really* have to be on WSL 2 in order for this to work - if you see errors l
 
 **NOTE:** You may be running Linux distribution with OpenSSH version more recent than your Windows host has out of the box. Presently Ubuntu 22.04 and Arch both demonstrate this - communication with ssh-agent will fail. In such cases please visit [Windows OpenSSH](https://github.com/PowerShell/Win32-OpenSSH) development and update your Windows OpenSSH with latest release.
 
+**NOTE:** If you are having issues using `wsl-ssh-agent-relay` with systemd try adding `:WSLInterop:M::MZ::/init:PF` to `/usr/lib/binfmt.d/WSLInterop.conf`. For example (thanks to [rkl110](https://github.com/rkl110) - [Microsoft/WSL - Issue 8843](https://github.com/microsoft/WSL/issues/8843)):
+
+```bash
+sudo sh -c 'echo :WSLInterop:M::MZ::/init:PF > /usr/lib/binfmt.d/WSLInterop.conf'
+```
+
 ## Helper to interface with Windows ssh-agent.exe service from WSL1 (replacement for ssh-agent-wsl).
 [![GitHub Release](https://img.shields.io/github/release/rupor-github/wsl-ssh-agent.svg)](https://github.com/rupor-github/wsl-ssh-agent/releases)