diff --git a/cohort/assign.php b/cohort/assign.php
index 6befd5b0e44..0d6c83af9ec 100644
--- a/cohort/assign.php
+++ b/cohort/assign.php
@@ -17,13 +17,12 @@
 /**
  * Cohort related management functions, this file needs to be included manually.
  *
- * @package    core
- * @subpackage cohort
+ * @package    core_cohort
  * @copyright  2010 Petr Skoda  {@link http://skodak.org}
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-require_once('../config.php');
+require('../config.php');
 require_once($CFG->dirroot.'/cohort/locallib.php');
 
 $id = required_param('id', PARAM_INT);
@@ -41,7 +40,7 @@ $PAGE->set_url('/cohort/assign.php', array('id'=>$id));
 $returnurl = new moodle_url('/cohort/index.php', array('contextid'=>$cohort->contextid));
 
 if (!empty($cohort->component)) {
-    // we can not manually edit cohorts that were created by external systems, sorry
+    // We can not manually edit cohorts that were created by external systems, sorry.
     redirect($returnurl);
 }
 
diff --git a/cohort/edit.php b/cohort/edit.php
index 721d790ed67..3a18ddb9327 100644
--- a/cohort/edit.php
+++ b/cohort/edit.php
@@ -1,5 +1,4 @@
 <?php
-
 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
@@ -15,12 +14,10 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
-
 /**
  * Cohort related management functions, this file needs to be included manually.
  *
- * @package    core
- * @subpackage cohort
+ * @package    core_cohort
  * @copyright  2010 Petr Skoda  {@link http://skodak.org}
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
@@ -58,7 +55,7 @@ require_capability('moodle/cohort:manage', $context);
 $returnurl = new moodle_url('/cohort/index.php', array('contextid'=>$context->id));
 
 if (!empty($cohort->component)) {
-    // we can not manually edit cohorts that were created by external systems, sorry
+    // We can not manually edit cohorts that were created by external systems, sorry.
     redirect($returnurl);
 }
 
@@ -97,12 +94,12 @@ if ($delete and $cohort->id) {
 
 $editoroptions = array('maxfiles'=>0, 'context'=>$context);
 if ($cohort->id) {
-    // edit existing
+    // Edit existing.
     $cohort = file_prepare_standard_editor($cohort, 'description', $editoroptions, $context);
     $strheading = get_string('editcohort', 'cohort');
 
 } else {
-    // add new
+    // Add new.
     $cohort = file_prepare_standard_editor($cohort, 'description', $editoroptions, $context);
     $strheading = get_string('addcohort', 'cohort');
 }
@@ -125,7 +122,7 @@ if ($editform->is_cancelled()) {
         cohort_add_cohort($data);
     }
 
-    // use new context id, it could have been changed
+    // Use new context id, it could have been changed.
     redirect(new moodle_url('/cohort/index.php', array('contextid'=>$data->contextid)));
 }
 
diff --git a/cohort/edit_form.php b/cohort/edit_form.php
index 81e7a7cb6c0..c23c249b97c 100644
--- a/cohort/edit_form.php
+++ b/cohort/edit_form.php
@@ -1,5 +1,4 @@
 <?php
-
 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
@@ -18,15 +17,12 @@
 /**
  * Cohort related management functions, this file needs to be included manually.
  *
- * @package    core
- * @subpackage cohort
+ * @package    core_cohort
  * @copyright  2010 Petr Skoda  {@link http://skodak.org}
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-if (!defined('MOODLE_INTERNAL')) {
-    die('Direct access to this script is forbidden.');    ///  It must be included from a Moodle page
-}
+defined('MOODLE_INTERNAL') || die();
 
 require_once($CFG->dirroot . '/lib/formslib.php');
 
@@ -49,7 +45,7 @@ class cohort_edit_form extends moodleform {
         $mform->addElement('select', 'contextid', get_string('context', 'role'), $options);
 
         $mform->addElement('text', 'idnumber', get_string('idnumber', 'cohort'), 'maxlength="254" size="50"');
-        $mform->setType('idnumber', PARAM_RAW); // idnumbers are plain text, must not be changed
+        $mform->setType('idnumber', PARAM_RAW); // Idnumbers are plain text, must not be changed.
 
         $mform->addElement('editor', 'description_editor', get_string('description', 'cohort'), null, $editoroptions);
         $mform->setType('description_editor', PARAM_RAW);
@@ -69,7 +65,7 @@ class cohort_edit_form extends moodleform {
 
         $idnumber = trim($data['idnumber']);
         if ($idnumber === '') {
-            // fine, empty is ok
+            // Fine, empty is ok.
 
         } else if ($data['id']) {
             $current = $DB->get_record('cohort', array('id'=>$data['id']), '*', MUST_EXIST);
@@ -95,16 +91,16 @@ class cohort_edit_form extends moodleform {
         $options = array();
         $syscontext = context_system::instance();
         if (has_capability('moodle/cohort:manage', $syscontext)) {
-            $options[$syscontext->id] = print_context_name($syscontext);
+            $options[$syscontext->id] = $syscontext->get_context_name();
         }
         foreach ($displaylist as $cid=>$name) {
             $context = context_coursecat::instance($cid);
             $options[$context->id] = $name;
         }
-        // always add current - this is not likely, but if the logic gets changed it might be a problem
+        // Always add current - this is not likely, but if the logic gets changed it might be a problem.
         if (!isset($options[$currentcontextid])) {
             $context = context::instance_by_id($currentcontextid, MUST_EXIST);
-            $options[$context->id] = print_context_name($syscontext);
+            $options[$context->id] = $syscontext->get_context_name();
         }
         return $options;
     }
diff --git a/cohort/index.php b/cohort/index.php
index 00aab668325..0ce53bd872f 100644
--- a/cohort/index.php
+++ b/cohort/index.php
@@ -1,5 +1,4 @@
 <?php
-
 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
@@ -18,8 +17,7 @@
 /**
  * Cohort related management functions, this file needs to be included manually.
  *
- * @package    core
- * @subpackage cohort
+ * @package    core_cohort
  * @copyright  2010 Petr Skoda  {@link http://skodak.org}
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
@@ -71,10 +69,10 @@ echo $OUTPUT->header();
 
 echo $OUTPUT->heading(get_string('cohortsin', 'cohort', print_context_name($context)));
 
-// add search form
+// Add search form.
 $search  = html_writer::start_tag('form', array('id'=>'searchcohortquery', 'method'=>'get'));
 $search .= html_writer::start_tag('div');
-$search .= html_writer::label(get_string('searchcohort', 'cohort').':', 'cohort_search_q');
+$search .= html_writer::label(get_string('searchcohort', 'cohort'), 'cohort_search_q'); // No : in form labels!
 $search .= html_writer::empty_tag('input', array('id'=>'cohort_search_q', 'type'=>'text', 'name'=>'search', 'value'=>$searchquery));
 $search .= html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('search', 'cohort')));
 $search .= html_writer::end_tag('div');
@@ -83,7 +81,7 @@ echo $search;
 
 $cohorts = cohort_get_cohorts($context->id, $page, 25, $searchquery);
 
-// output pagination bar
+// Output pagination bar.
 $params = array('page' => $page);
 if ($contextid) {
     $params['contextid'] = $contextid;
@@ -98,7 +96,7 @@ $data = array();
 foreach($cohorts['cohorts'] as $cohort) {
     $line = array();
     $line[] = format_string($cohort->name);
-    $line[] = s($cohort->idnumber); // plain text
+    $line[] = s($cohort->idnumber); // All idnumbers are plain text.
     $line[] = format_text($cohort->description, $cohort->descriptionformat);
 
     $line[] = $DB->count_records('cohort_members', array('cohortid'=>$cohort->id));
@@ -137,4 +135,4 @@ if ($manager) {
     echo $OUTPUT->single_button(new moodle_url('/cohort/edit.php', array('contextid'=>$context->id)), get_string('add'));
 }
 
-echo $OUTPUT->footer();
\ No newline at end of file
+echo $OUTPUT->footer();
diff --git a/cohort/lib.php b/cohort/lib.php
index 88b00f15da7..f2d425079eb 100644
--- a/cohort/lib.php
+++ b/cohort/lib.php
@@ -27,8 +27,8 @@ defined('MOODLE_INTERNAL') || die();
 /**
  * Add new cohort.
  *
- * @param  object $cohort
- * @return int
+ * @param  stdClass $cohort
+ * @return int new cohort id
  */
 function cohort_add_cohort($cohort) {
     global $DB;
@@ -65,7 +65,7 @@ function cohort_add_cohort($cohort) {
 
 /**
  * Update existing cohort.
- * @param  object $cohort
+ * @param  stdClass $cohort
  * @return void
  */
 function cohort_update_cohort($cohort) {
@@ -82,7 +82,7 @@ function cohort_update_cohort($cohort) {
 
 /**
  * Delete cohort.
- * @param  object $cohort
+ * @param  stdClass $cohort
  * @return void
  */
 function cohort_delete_cohort($cohort) {
@@ -102,7 +102,7 @@ function cohort_delete_cohort($cohort) {
  * Somehow deal with cohorts when deleting course category,
  * we can not just delete them because they might be used in enrol
  * plugins or referenced in external systems.
- * @param  object $category
+ * @param  stdClass $category
  * @return void
  */
 function cohort_delete_category($category) {
diff --git a/cohort/locallib.php b/cohort/locallib.php
index 7465140429b..cfc4b73efd8 100644
--- a/cohort/locallib.php
+++ b/cohort/locallib.php
@@ -27,6 +27,7 @@ defined('MOODLE_INTERNAL') || die();
 require_once($CFG->dirroot . '/cohot/lib.php');
 require_once($CFG->dirroot . '/user/selector/lib.php');
 
+
 /**
  * Cohort assignment candidates
  */
@@ -40,12 +41,12 @@ class cohort_candidate_selector extends user_selector_base {
 
     /**
      * Candidate users
-     * @param <type> $search
+     * @param string $search
      * @return array
      */
     public function find_users($search) {
         global $DB;
-        //by default wherecondition retrieves all users except the deleted, not confirmed and guest
+        // By default wherecondition retrieves all users except the deleted, not confirmed and guest.
         list($wherecondition, $params) = $this->search_sql($search, 'u');
         $params['cohortid'] = $this->cohortid;
 
@@ -103,12 +104,12 @@ class cohort_existing_selector extends user_selector_base {
 
     /**
      * Candidate users
-     * @param <type> $search
+     * @param string $search
      * @return array
      */
     public function find_users($search) {
         global $DB;
-        //by default wherecondition retrieves all users except the deleted, not confirmed and guest
+        // By default wherecondition retrieves all users except the deleted, not confirmed and guest.
         list($wherecondition, $params) = $this->search_sql($search, 'u');
         $params['cohortid'] = $this->cohortid;