diff --git a/mod/assign/externallib.php b/mod/assign/externallib.php
index cb85521015a..49575b9a3ac 100644
--- a/mod/assign/externallib.php
+++ b/mod/assign/externallib.php
@@ -269,7 +269,8 @@ class mod_assign_external extends external_api {
      * @since  Moodle 2.4
      */
     public static function get_assignments($courseids = array(), $capabilities = array()) {
-        global $USER, $DB;
+        global $USER, $DB, $CFG;
+        require_once("$CFG->dirroot/mod/assign/locallib.php");
 
         $params = self::validate_parameters(
             self::get_assignments_parameters(),
@@ -336,7 +337,9 @@ class mod_assign_external extends external_api {
                      'm.maxattempts, ' .
                      'm.markingworkflow, ' .
                      'm.markingallocation, ' .
-                     'm.requiresubmissionstatement';
+                     'm.requiresubmissionstatement, '.
+                     'm.intro, '.
+                     'm.introformat';
         $coursearray = array();
         foreach ($courses as $id => $course) {
             $assignmentarray = array();
@@ -370,7 +373,7 @@ class mod_assign_external extends external_api {
                     }
                     $configrecords->close();
 
-                    $assignmentarray[]= array(
+                    $assignment = array(
                         'id' => $module->assignmentid,
                         'cmid' => $module->id,
                         'course' => $module->course,
@@ -398,6 +401,34 @@ class mod_assign_external extends external_api {
                         'requiresubmissionstatement' => $module->requiresubmissionstatement,
                         'configs' => $configarray
                     );
+
+                    // Return or not intro and file attachments depending on the plugin settings.
+                    $assign = new assign($context, null, null);
+
+                    if ($assign->show_intro()) {
+
+                        list($assignment['intro'], $assignment['introformat']) = external_format_text($module->intro,
+                            $module->introformat, $context->id, 'mod_assign', ASSIGN_INTROATTACHMENT_FILEAREA, 0);
+
+                        $fs = get_file_storage();
+                        if ($files = $fs->get_area_files($context->id, 'mod_assign', ASSIGN_INTROATTACHMENT_FILEAREA,
+                                                            0, 'timemodified', false)) {
+
+                            $assignment['introattachments'] = array();
+                            foreach ($files as $file) {
+                                $filename = $file->get_filename();
+
+                                $assignment['introattachments'][] = array(
+                                    'filename' => $filename,
+                                    'mimetype' => $file->get_mimetype(),
+                                    'fileurl'  => moodle_url::make_webservice_pluginfile_url(
+                                        $context->id, 'mod_assign', ASSIGN_INTROATTACHMENT_FILEAREA, 0, '/', $filename)->out(false)
+                                );
+                            }
+                        }
+                    }
+
+                    $assignmentarray[] = $assignment;
                 }
             }
             $coursearray[]= array(
@@ -450,7 +481,19 @@ class mod_assign_external extends external_api {
                 'markingworkflow' => new external_value(PARAM_INT, 'enable marking workflow'),
                 'markingallocation' => new external_value(PARAM_INT, 'enable marking allocation'),
                 'requiresubmissionstatement' => new external_value(PARAM_INT, 'student must accept submission statement'),
-                'configs' => new external_multiple_structure(self::get_assignments_config_structure(), 'configuration settings')
+                'configs' => new external_multiple_structure(self::get_assignments_config_structure(), 'configuration settings'),
+                'intro' => new external_value(PARAM_RAW,
+                    'assignment intro, not allways returned because it deppends on the activity configuration', VALUE_OPTIONAL),
+                'introformat' => new external_format_value('intro', VALUE_OPTIONAL),
+                'introattachments' => new external_multiple_structure(
+                    new external_single_structure(
+                        array (
+                            'filename' => new external_value(PARAM_FILE, 'file name'),
+                            'mimetype' => new external_value(PARAM_RAW, 'mime type'),
+                            'fileurl'  => new external_value(PARAM_URL, 'file download url')
+                        )
+                    ), 'intro attachments files', VALUE_OPTIONAL
+                )
             ), 'assignment information object');
     }