diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-messaging.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-messaging.tt
index 3b5d5e95a7..3004c4932b 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-messaging.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-messaging.tt
@@ -191,7 +191,7 @@
                                             <li>
                                                 <label for="SMSnumber">SMS number:</label>
                                                 <input type="text" id="SMSnumber" name="SMSnumber" value="[% SMSnumber | html %]" pattern="^(\+[1-9]\d{0,2})?\d{1,12}$" />
-                                                <span class="hint sms_number_help">Please enter numbers only. Prefix the number with + if including the country code.</span>
+                                                <span class="hint sms_number_help">Please enter numbers only. Prefix the number with + or 00 if including the country code.</span>
                                             </li>
 
                                             [% IF ( SMSSendDriver == 'Email' ) %]