diff --git a/examples/dataset.jsonld b/examples/dataset.jsonld
index a90406e..eb86d49 100644
--- a/examples/dataset.jsonld
+++ b/examples/dataset.jsonld
@@ -20,13 +20,21 @@
   "publisher": {
     "@type": "Organization",
     "@id": "https://www.kb.nl",
+    "identifier": "NL-HaKB",
     "name": "Koninklijke Bibliotheek",
     "alternateName": "KB",
-    "sameAs": "https://ror.org/02w4jbg70"
+    "sameAs": "https://ror.org/02w4jbg70",
+    "contactPoint": {
+      "@type": "ContactPoint",
+      "name": "Dataset manager’s name",
+      "email": "datasets@kb.nl",
+      "telephone": "+31 6 12345678"
+    }
   },
   "creator": {
     "@type": "Organization",
     "@id": "https://www.kb.nl",
+    "identifier": "NL-HaKB",
     "name": "Koninklijke Bibliotheek",
     "alternateName": "KB",
     "sameAs": "https://ror.org/02w4jbg70",
diff --git a/index.bs b/index.bs
index c16f224..7becdd4 100644
--- a/index.bs
+++ b/index.bs
@@ -315,6 +315,23 @@ See [[#organization-overview]] for a full overview of organization attributes.
     </pre>
 </div>
 
+### ISIL identifier ### {#isil}
+
+> Publishers *SHOULD* include the organization’s [ISIL code](https://www.nationaalarchief.nl/archiveren/kennisbank/isil-codes).
+
+<div class="example">
+    An organization with an ISIL code:
+
+    <pre highlight=json-ld>
+      {
+        "@context": "https://schema.org/",
+        "@type": "Organization",
+        "@id": "https://www.kb.nl",
+        "identifier": "NL-HaKB"
+      }
+    </pre>
+</div> 
+
 ### Contact information ### {#contact}
 
 Publishers *SHOULD* include contact information so [=consumers=] can reach them with questions or feedback.
@@ -357,6 +374,7 @@ The person/organization data is then included as the dataset’s publisher:
           "publisher": {
             "@type": "Organization",
             "@id": "https://www.kb.nl",
+            "identifier": "NL-HaKB"
             "name": "Koninklijke Bibliotheek",
             "alternateName": "KB",
             "contactPoint": {
@@ -781,6 +799,12 @@ This is an overview of required and recommended attributes.
             <td>1</td>
             <td>Required</td>
         </tr>
+        <tr>
+            <th scope="row">[schema:identifier](https://schema.org/identifier)</th>
+            <td>Identifier(s) of the organization, at least its <a href="https://www.nationaalarchief.nl/archiveren/kennisbank/isil-codes">ISIL code</a></td>
+            <td>1..n</td>
+            <td>Recommended (will become required)</td>
+        </tr>
         <tr>
             <th scope="row">[schema:name](https://schema.org/name)</th>
             <td>The organization’s full name.</td>
@@ -803,7 +827,7 @@ This is an overview of required and recommended attributes.
             <th scope="row">[schema:contactPoint](https://schema.org/contactPoint)</th>
             <td>Where [=consumers=] can reach the organization for questions and suggestions about the dataset.</td>
             <td>1</td>
-            <td>Recommended (scheduled to become Required for schema:publisher)</td>
+            <td>Recommended (will become required for schema:publisher)</td>
         </tr>
     </tbody>
 </table>
@@ -845,7 +869,7 @@ When the distribution is compressed, the compression format (e.g. zip, gzip) sho
         </tr>
         <tr>
             <th scope="row">[schema:description](https://schema.org/description)</th>
-            <td>A description of the the distribution.</td>
+            <td>A description of the distribution.</td>
             <td>0..1</td>            
             <td>Recommended</td>
         </tr>