diff --git a/ipaddresses.php b/ipaddresses.php
index 2df9730..03dfa2f 100644
--- a/ipaddresses.php
+++ b/ipaddresses.php
@@ -22,7 +22,7 @@ class ipaddresses
   public function validIPv4Address ($ip)
   {
     if (!is_string ($ip) || $ip === "")
-      throw new \Exception (dgettext("domframework", "Invalid IP address"), 500);
+      throw new \Exception (dgettext("domframework", "Invalid IPv4 address"), 500);
     $rc = filter_var ($ip, FILTER_VALIDATE_IP,  FILTER_FLAG_IPV4);
     if ($rc ===FALSE)
       return FALSE;
@@ -33,7 +33,7 @@ class ipaddresses
   public function validIPv6Address ($ip)
   {
     if (!is_string ($ip) || $ip === "")
-      throw new \Exception (dgettext("domframework", "Invalid IP address"), 500);
+      throw new \Exception (dgettext("domframework", "Invalid IPv6 address"), 500);
     $rc = filter_var ($ip, FILTER_VALIDATE_IP,  FILTER_FLAG_IPV6);
     if ($rc ===FALSE)
       return FALSE;