Update preserving-client-ip-addresses.md

docs/guides/preserving-client-ip-addresses.md

@@ -1,5 +1,9 @@
 # AWS
 
+> 🚧
+> 
+> Changing this configuration may result in a few minutes of downtime. It is recommended to set up client IP addresses before the application is live, or update it during a maintenance window. For more information, see [this Github issue](https://github.com/porter-dev/porter/issues/632#issuecomment-832939982).
+ 
 You will need to update your NGINX config to support proxying external IP addresses to Porter.
 
 In the `ingress-nginx` application, you'll be modifying the following Helm values:
@@ -64,4 +68,4 @@ It should look something like this:
 
 ![Healthz config](https://files.readme.io/9b5432a-Screen_Shot_2021-05-10_at_4.24.13_PM.png "Screen Shot 2021-05-10 at 4.24.13 PM.png")
 
-5. Click "Deploy". It will take 10-15 minutes for the load balancer to be created and the certificates to be issued.
+5. Click "Deploy". It will take 10-15 minutes for the load balancer to be created and the certificates to be issued.