diff --git a/lam/docs/modules-specification.htm b/lam/docs/modules-specification.htm
index 12184279..c7332293 100644
--- a/lam/docs/modules-specification.htm
+++ b/lam/docs/modules-specification.htm
@@ -492,10 +492,14 @@ help:</span> help ID</li>
   <li><span style="font-weight: bold;"><span style="font-style: italic;">string</span>
 example:</span> example value</li>
   <li><span style="font-weight: bold;"><span style="font-style: italic;">boolean</span>
-required:</span> true, if user must set a value for this column</li>
+required:</span> true, if user must set a value for this column <span
+ style="font-weight: bold; font-style: italic;">(optional, default:
+"false")</span><br>
+  </li>
   <li><span style="font-weight: bold;">boolean unique:</span> true if
 all values of this column must be different values <span
- style="font-style: italic; font-weight: bold;">(optional)</span><br>
+ style="font-style: italic; font-weight: bold;">(optional, default:
+"false")</span><br>
   </li>
 </ul>
 <br>