diff --git a/md/clause-5.md b/md/clause-5.md
index 59d1fe66873dd0f59946c1448ecb3da09bb474cb..c3df0a831f7d289e069a5482084640339cac507b 100644
--- a/md/clause-5.md
+++ b/md/clause-5.md
@@ -392,6 +392,9 @@ Table: Matrix of all Attributes
 |                                    |                                                                       | property-scoped definition within             |
 |                                    |                                                                       | _`notUpdated`_                                |
 +------------------------------------+-----------------------------------------------------------------------+-----------------------------------------------+
+| _`attributeNames`_                 | EntityType                                                            | Type-scoped definition within                 |
+|                                    |                                                                       | [type="EntityType"]{.HTML-Code},              |
++------------------------------------+-----------------------------------------------------------------------+-----------------------------------------------+
 | _`attributeTypes`_                 | Attribute                                                             | Type-scoped definition within                 |
 |                                    |                                                                       | [type="Attribute"]{.HTML-Code}                |
 +------------------------------------+-----------------------------------------------------------------------+-----------------------------------------------+