diff --git a/db/install.xml b/db/install.xml
index 98af795..adedf9a 100644
--- a/db/install.xml
+++ b/db/install.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="local/treestudyplan/db" VERSION="20230821" COMMENT="XMLDB file for Moodle local/treestudyplan"
+<XMLDB PATH="local/treestudyplan/db" VERSION="20231019" COMMENT="XMLDB file for Moodle local/treestudyplan"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
@@ -27,6 +27,7 @@
         <FIELD NAME="name" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
         <FIELD NAME="shortname" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
         <FIELD NAME="description" TYPE="text" NOTNULL="false" SEQUENCE="false"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
         <FIELD NAME="idnumber" TYPE="text" NOTNULL="false" SEQUENCE="false"/>
         <FIELD NAME="aggregation" TYPE="char" LENGTH="30" NOTNULL="true" DEFAULT="bistate" SEQUENCE="false"/>
         <FIELD NAME="aggregation_config" TYPE="text" NOTNULL="false" SEQUENCE="false"/>
diff --git a/db/upgrade.php b/db/upgrade.php
index f02fbaf..856d2b6 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -493,5 +493,20 @@ function xmldb_local_treestudyplan_upgrade($oldversion) {
         upgrade_plugin_savepoint(true, 2023082100, 'local', 'treestudyplan');
     }
 
+    if ($oldversion < 2023101900) {
+
+        // Define field descriptionformat to be added to local_treestudyplan.
+        $table = new xmldb_table('local_treestudyplan');
+        $field = new xmldb_field('descriptionformat', XMLDB_TYPE_INTEGER, '4', null, XMLDB_NOTNULL, null, '0', 'description');
+
+        // Conditionally launch add field descriptionformat.
+        if (!$dbman->field_exists($table, $field)) {
+            $dbman->add_field($table, $field);
+        }
+
+        // Treestudyplan savepoint reached.
+        upgrade_plugin_savepoint(true, 2023101900, 'local', 'treestudyplan');
+    }
+
     return true;
 }