diff --git a/tabellio/documents/indexer.py b/tabellio/documents/indexer.py
index 0f45688..bb89aa7 100644
--- a/tabellio/documents/indexer.py
+++ b/tabellio/documents/indexer.py
@@ -85,6 +85,16 @@ questionInterveningPersonsIndexer = indexer(IQuestion)(interveningPersonsIndexer
 grok.global_adapter(dossierInterveningPersonsIndexer, name="interveningPersonsDoc")
 grok.global_adapter(questionInterveningPersonsIndexer, name="interveningPersonsDoc")
 
+def commissionsIndexer(obj):
+    if not obj.commissions:
+        return None
+    return [item.to_object.id for item in obj.commissions]
+
+dossierPolgroupsIndexer = indexer(IDossier)(commissionsIndexer)
+
+grok.global_adapter(dossierCommissionssIndexer, name="commissionsDoc")
+
+
 
 class IDocumentIndexer(Interface):
     """Dexterity behavior interface for enabling the dynamic SearchableText
diff --git a/tabellio/documents/profiles/default/catalog.xml b/tabellio/documents/profiles/default/catalog.xml
index 96c2c4b..0d5aa60 100644
--- a/tabellio/documents/profiles/default/catalog.xml
+++ b/tabellio/documents/profiles/default/catalog.xml
@@ -18,6 +18,9 @@
   <index name="authorsDoc" meta_type="KeywordIndex">
     <indexed_attr value="authorsDoc"/>
   </index>
+  <index name="commissionsDoc" meta_type="KeywordIndex">
+    <indexed_attr value="commissionsDoc"/>
+  </index>
   <index name="no" meta_type="FieldIndex">
     <indexed_attr value="no"/>
   </index>