diff --git a/interface/web/sites/lib/lang/en_web_domain.lng b/interface/web/sites/lib/lang/en_web_domain.lng
index f0938338b162f5b0091d2cacc52a0735ee21c49b..9b1d5bb7c1fe07f127efb0785c5ecdaba8cf1723 100644
--- a/interface/web/sites/lib/lang/en_web_domain.lng
+++ b/interface/web/sites/lib/lang/en_web_domain.lng
@@ -35,7 +35,7 @@ $wb["limit_web_aliasdomain_txt"] = 'The max. number of aliasdomains for your acc
 $wb["limit_web_subdomain_txt"] = 'The max. number of web subdomains for your account is reached.';
 $wb["apache_directives_txt"] = 'Apache directives';
 $wb["domain_error_empty"] = 'Domain is empty.';
-$wb["domain_error_unique"] = 'Domain must be unique.';
+$wb["domain_error_unique"] = 'There is already a website or sub / aliasdomain with this domain name.';
 $wb["domain_error_regex"] = 'Domain name invalid.';
 $wb["hd_quota_error_empty"] = 'Harddisk quota is empty.';
 $wb["traffic_quota_error_empty"] = 'Traffic quota is empty.';
diff --git a/interface/web/sites/lib/lang/en_web_subdomain.lng b/interface/web/sites/lib/lang/en_web_subdomain.lng
index 1fdbea1eae4d09cef0f7ae7a6dad383dddcff11d..d028a71e4d8063fa3af9f012a24edf446d618579 100644
--- a/interface/web/sites/lib/lang/en_web_subdomain.lng
+++ b/interface/web/sites/lib/lang/en_web_subdomain.lng
@@ -33,6 +33,6 @@ $wb["limit_web_aliasdomain_txt"] = 'The max. number of aliasdomains for your acc
 $wb["limit_web_subdomain_txt"] = 'The max. number of web subdomains for your account is reached.';
 $wb["apache_directives_txt"] = 'Apache directives';
 $wb["domain_error_empty"] = 'Domain is empty.';
-$wb["domain_error_unique"] = 'Domain must be unique.';
+$wb["domain_error_unique"] = 'There is already a website or sub / aliasdomain with this domain name.';
 $wb["domain_error_regex"] = 'Domain name invalid.';
 ?>
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