diff --git a/hosts/backup_script.sh.sample b/hosts/backup_script.sh.sample
index 6a29530..b581f35 100644
--- a/hosts/backup_script.sh.sample
+++ b/hosts/backup_script.sh.sample
@@ -54,7 +54,12 @@ ssh_tunnel_key_file=
 ## -       LogLevel FATAL
 ## -
 ## - NOTE !!
-## -    you cannot have different entries for localhost.
+## -    If this is not working, check your 'HostKeyAlgorithms' settings at gateway. Maybe 
+## -    adding algorithm 'ecdsa-sha2-nistp256' helps. However, the default settings should 
+## -    work in any case.
+## -
+## - NOTE !!
+## -    you cannot have different entries for localhost in '/.ssh/config'.
 ## -
 ## - A ssh tunnel localhost -> $hop_host -> $target_host
 ## - will be created.