diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-memberentry.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-memberentry.tt
index 90215fb912..bbca649a55 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-memberentry.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-memberentry.tt
@@ -735,6 +735,7 @@
                                 <input type="hidden" name="captcha_digest" value="[% captcha_digest %]" />
 
                                 <span class="hint">Please type this following characters into the preceding box: <strong>[% captcha %]</strong></span>
+                                <span class="hint">Note: The preceding box is case-sensitive. Ensure that the entered characters are in all-caps.</span>
                             </li>
                         </ol>
                     </fieldset>