redis compile cache systemd issue

README.md

@@ -135,6 +135,9 @@ EOF
 
 ## Other caches
 Also set up `ccache` cluster with Redis for remote.
+Note, Redis needs `systemctl edit redis-server` to set timeouts
+to inifinity or it may just keep restarting itself. Thx systemd.
+
 And npm cache (verdaccio), rust cache (panamax),
 apt cache (apt-cacher-ng). And `sccache` for rust
 compiles.