diff --git a/mod/resource/db/install.xml b/mod/resource/db/install.xml
index c610af55981..b31e110d376 100644
--- a/mod/resource/db/install.xml
+++ b/mod/resource/db/install.xml
@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/resource/db" VERSION="20060812" COMMENT="XMLDB file for Moodle mod/resource">
+<XMLDB PATH="mod/resource/db" VERSION="20070120" COMMENT="XMLDB file for Moodle mod/resource"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
+>
   <TABLES>
     <TABLE NAME="resource" COMMENT="each record is one resource and its config data">
       <FIELDS>
@@ -8,7 +11,7 @@
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="course" NEXT="type"/>
         <FIELD NAME="type" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="name" NEXT="reference"/>
         <FIELD NAME="reference" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="type" NEXT="summary"/>
-        <FIELD NAME="summary" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="reference" NEXT="alltext"/>
+        <FIELD NAME="summary" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" ENUM="false" PREVIOUS="reference" NEXT="alltext"/>
         <FIELD NAME="alltext" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="summary" NEXT="popup"/>
         <FIELD NAME="popup" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="alltext" NEXT="options"/>
         <FIELD NAME="options" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="popup" NEXT="timemodified"/>
diff --git a/mod/resource/db/upgrade.php b/mod/resource/db/upgrade.php
index 4609dcf4f00..5152e08469e 100644
--- a/mod/resource/db/upgrade.php
+++ b/mod/resource/db/upgrade.php
@@ -38,6 +38,17 @@ function xmldb_resource_upgrade($oldversion=0) {
         //ignore result
     }
 
+    if ($result && $oldversion < 2007012000) {
+
+    /// Changing nullability of field summary on table resource to null
+        $table = new XMLDBTable('resource');
+        $field = new XMLDBField('summary');
+        $field->setAttributes(XMLDB_TYPE_TEXT, 'small', null, null, null, null, null, null, 'reference');
+
+    /// Launch change of nullability for field summary
+        $result = $result && change_field_notnull($table, $field);
+    }
+
     return $result;
 }
 
diff --git a/mod/resource/version.php b/mod/resource/version.php
index 06b10ce9827..3882cbdb53d 100644
--- a/mod/resource/version.php
+++ b/mod/resource/version.php
@@ -5,7 +5,7 @@
 //  This fragment is called by /admin/index.php
 ////////////////////////////////////////////////////////////////////////////////
 
-$module->version  = 2007011700;
+$module->version  = 2007012000;
 $module->requires = 2006091700;  // Requires this Moodle version
 $module->cron     = 0;