diff --git a/theme/overlay/layout/frontpage.php b/theme/overlay/layout/frontpage.php
index cc6d7264316..6a796eaf1c7 100644
--- a/theme/overlay/layout/frontpage.php
+++ b/theme/overlay/layout/frontpage.php
@@ -1,4 +1,26 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * The frontpage layout.
+ *
+ * @package   theme_overlay
+ * @copyright 2008 NodeThirtyThree (http://nodethirtythree.com/)
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 
 $hasheading = ($PAGE->heading);
 $hasnavbar = (empty($PAGE->layout_options['nonavbar']) && $PAGE->has_navbar());
diff --git a/theme/overlay/layout/general.php b/theme/overlay/layout/general.php
index 1534590240c..773c07f36c9 100644
--- a/theme/overlay/layout/general.php
+++ b/theme/overlay/layout/general.php
@@ -1,4 +1,26 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * The default layout.
+ *
+ * @package   theme_overlay
+ * @copyright 2008 NodeThirtyThree (http://nodethirtythree.com/)
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 
 $hasheading = ($PAGE->heading);
 $hasnavbar = (empty($PAGE->layout_options['nonavbar']) && $PAGE->has_navbar());
diff --git a/theme/overlay/lib.php b/theme/overlay/lib.php
index dccb3795b82..a77d8123af6 100644
--- a/theme/overlay/lib.php
+++ b/theme/overlay/lib.php
@@ -1,4 +1,33 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * This file contains functions specific to the needs of the Overlay theme.
+ *
+ * @package   theme_overlay
+ * @copyright 2008 NodeThirtyThree (http://nodethirtythree.com/)
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+/**
+ * Sets the link colour in CSS.
+ * @param string $css
+ * @param string $linkcolor
+ * @return string
+ */
 function overlay_set_linkcolor($css, $linkcolor) {
     $tag = '[[setting:linkcolor]]';
     $replacement = $linkcolor;
@@ -6,11 +35,15 @@ function overlay_set_linkcolor($css, $linkcolor) {
         $replacement = '#428ab5';
     }
     $css = str_replace($tag, $replacement, $css);
-    
-
     return $css;
 }
 
+/**
+ * Sets the header colour in CSS.
+ * @param string $css
+ * @param string $headercolor
+ * @return string
+ */
 function overlay_set_headercolor($css, $headercolor) {
     $tag = '[[setting:headercolor]]';
     $replacement = $headercolor;
@@ -18,12 +51,15 @@ function overlay_set_headercolor($css, $headercolor) {
         $replacement = '#2a4c7b';
     }
     $css = str_replace($tag, $replacement, $css);
-    
-
     return $css;
 }
 
-
+/**
+ * Adds custom CSS to the theme CSS before it is cached and delivered.
+ * @param string $css
+ * @param string $customcss
+ * @return string
+ */
 function overlay_set_customcss($css, $customcss) {
     $tag = '[[setting:customcss]]';
     $replacement = $customcss;
@@ -34,36 +70,35 @@ function overlay_set_customcss($css, $customcss) {
     return $css;
 }
 
-
-
-
-
+/**
+ * Processes CSS before it is cached and delivered, applying theme customisations.
+ * @param string $css
+ * @param theme_config $theme
+ * @return string
+ */
 function overlay_process_css($css, $theme) {
-       
-     if (!empty($theme->settings->linkcolor)) {
+
+    if (!empty($theme->settings->linkcolor)) {
         $linkcolor = $theme->settings->linkcolor;
     } else {
         $linkcolor = null;
     }
     $css = overlay_set_linkcolor($css, $linkcolor);
-	
-	 if (!empty($theme->settings->headercolor)) {
+
+    if (!empty($theme->settings->headercolor)) {
         $headercolor = $theme->settings->headercolor;
     } else {
         $headercolor = null;
     }
     $css = overlay_set_headercolor($css, $headercolor);
-	
-     if (!empty($theme->settings->customcss)) {
+
+    if (!empty($theme->settings->customcss)) {
         $customcss = $theme->settings->customcss;
     } else {
         $customcss = null;
     }
     $css = overlay_set_customcss($css, $customcss);
-    
+
     return $css;
-    
-    
-    
 }
 
diff --git a/theme/overlay/settings.php b/theme/overlay/settings.php
index 6c73fc8273c..8400f0167f0 100644
--- a/theme/overlay/settings.php
+++ b/theme/overlay/settings.php
@@ -1,45 +1,64 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Settings for the overlay theme.
+ *
+ * @package   theme_overlay
+ * @copyright 2008 NodeThirtyThree (http://nodethirtythree.com/)
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 
 defined('MOODLE_INTERNAL') || die;
 
 if ($ADMIN->fulltree) {
 
+    // link color setting.
+    $name = 'theme_overlay/linkcolor';
+    $title = get_string('linkcolor','theme_overlay');
+    $description = get_string('linkcolordesc', 'theme_overlay');
+    $default = '#428ab5';
+    $previewconfig = NULL;
+    $setting = new admin_setting_configcolourpicker($name, $title, $description, $default, $previewconfig);
+    $setting->set_updatedcallback('theme_reset_all_caches');
+    $settings->add($setting);
 
-// link color setting
-$name = 'theme_overlay/linkcolor';
-$title = get_string('linkcolor','theme_overlay');
-$description = get_string('linkcolordesc', 'theme_overlay');
-$default = '#428ab5';
-$previewconfig = NULL;
-$setting = new admin_setting_configcolourpicker($name, $title, $description, $default, $previewconfig);
-$setting->set_updatedcallback('theme_reset_all_caches');
-$settings->add($setting);
+    // Tag line setting.
+    $name = 'theme_overlay/headercolor';
+    $title = get_string('headercolor','theme_overlay');
+    $description = get_string('headercolordesc', 'theme_overlay');
+    $default = '#2a4c7b';
+    $previewconfig = NULL;
+    $setting = new admin_setting_configcolourpicker($name, $title, $description, $default, $previewconfig);
+    $setting->set_updatedcallback('theme_reset_all_caches');
+    $settings->add($setting);
 
+    // Foot note setting.
+    $name = 'theme_overlay/footertext';
+    $title = get_string('footertext','theme_overlay');
+    $description = get_string('footertextdesc', 'theme_overlay');
+    $setting = new admin_setting_confightmleditor($name, $title, $description, '');
+    $setting->set_updatedcallback('theme_reset_all_caches');
+    $settings->add($setting);
 
-// Tag line setting
-$name = 'theme_overlay/headercolor';
-$title = get_string('headercolor','theme_overlay');
-$description = get_string('headercolordesc', 'theme_overlay');
-$default = '#2a4c7b';
-$previewconfig = NULL;
-$setting = new admin_setting_configcolourpicker($name, $title, $description, $default, $previewconfig);
-$setting->set_updatedcallback('theme_reset_all_caches');
-$settings->add($setting);
-
-// Foot note setting
-$name = 'theme_overlay/footertext';
-$title = get_string('footertext','theme_overlay');
-$description = get_string('footertextdesc', 'theme_overlay');
-$setting = new admin_setting_confightmleditor($name, $title, $description, '');
-$setting->set_updatedcallback('theme_reset_all_caches');
-$settings->add($setting);
-
-// Custom CSS file
-$name = 'theme_overlay/customcss';
-$title = get_string('customcss','theme_overlay');
-$description = get_string('customcssdesc', 'theme_overlay');
-$setting = new admin_setting_configtextarea($name, $title, $description, '');
-$setting->set_updatedcallback('theme_reset_all_caches');
-$settings->add($setting);
-
+    // Custom CSS file.
+    $name = 'theme_overlay/customcss';
+    $title = get_string('customcss','theme_overlay');
+    $description = get_string('customcssdesc', 'theme_overlay');
+    $setting = new admin_setting_configtextarea($name, $title, $description, '');
+    $setting->set_updatedcallback('theme_reset_all_caches');
+    $settings->add($setting);
 }
\ No newline at end of file
diff --git a/theme/overlay/version.php b/theme/overlay/version.php
index 973b2601db7..8c224ad939e 100644
--- a/theme/overlay/version.php
+++ b/theme/overlay/version.php
@@ -24,9 +24,9 @@
 
 defined('MOODLE_INTERNAL') || die;
 
-$plugin->version   = 2013110500; // The current module version (Date: YYYYMMDDXX)
-$plugin->requires  = 2013110500; // Requires this Moodle version
-$plugin->component = 'theme_overlay'; // Full name of the plugin (used for diagnostics)
+$plugin->version   = 2013110500; // The current module version (Date: YYYYMMDDXX).
+$plugin->requires  = 2013110500; // Requires this Moodle version.
+$plugin->component = 'theme_overlay'; // Full name of the plugin (used for diagnostics).
 $plugin->dependencies = array(
     'theme_canvas'  => 2013110500,
 );