Add note about workaround to avoid culling by inactivity

admin/howto/control-user-server.md

@@ -90,6 +90,11 @@ server](user-server/stopping), but should be distinguished from "culling a
 kernel" inside a user server. [jupyterhub-idle-culler] is only involved in
 culling user servers, not culling kernels.
 
+```{note}
+A crude way to ensure that a server isn't stopped for inactivity is can be read
+about [here](https://github.com/jupyterhub/jupyterhub-idle-culler/issues/55#issuecomment-1413510651).
+```
+
 ## Stop user servers after maximum age
 
 As a failsafe [jupyterhub-idle-culler] is by 2i2c's defaults configured to stop