diff --git a/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm b/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
index 32e8d3776..ac9601d44 100644
--- a/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
+++ b/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
@@ -154,7 +154,11 @@ end
 	    <div class="cbi-value">
 		<label class="cbi-value-title"><%:IPv6 ULA-Prefix%></label>
 		<div class="cbi-value-field">
-		    <input type="text" name="ula" class="cbi-input-text" value="<%=uci:get("network","globals","ula_prefix")%>" />
+		    <input type="text" name="ula" class="cbi-input-text" value="<%=uci:get("network","globals","ula_prefix")%>" data-type="ula_prefix" />
+		    <br />
+		    <div class="cbi-value-description">
+		        <%:You can set a public IPv6 prefix only if you set only one server.%>
+		    </div>
 		</div>
 	    </div>
 	</fieldset>