diff --git a/solr.cfg b/solr.cfg
index 43eac5f..2ea4bd8 100644
--- a/solr.cfg
+++ b/solr.cfg
@@ -71,6 +71,7 @@ index =
     name:sender_as_text   type:string stored:true
     name:recipients_as_text type:string stored:true
     name:object_folders   type:string stored:false multivalued:true
+    name:thesaurus_keywords   type:string stored:false multivalued:true
     name:reception_date   type:date stored:true
     name:mail_date        type:date stored:true
     name:meeting_date     type:date stored:true