diff --git a/backup-config/lang/en b/backup-config/lang/en
index 674edc04d..acf31d2b6 100644
--- a/backup-config/lang/en
+++ b/backup-config/lang/en
@@ -74,7 +74,7 @@ backup_eserver2=Missing or invalid SSH server
 backup_epath=Missing or invalid absolute path on FTP server
 backup_epath2=Missing or invalid absolute path on SSH server
 backup_euser=Invalid characters in FTP server login
-backup_epass=Invalid characters in FTP server password
+backup_epass=Invalid characters in FTP server password - @, : and / cannot be used
 backup_eport=Missing or invalid FTP server port
 backup_esport=Missing or invalid SSH server port
 backup_emods=No modules selected