diff --git a/core/modules/contextual/contextual-rtl.css b/core/modules/contextual/contextual-rtl.css
index 96ffef5..83c0f1e 100644
--- a/core/modules/contextual/contextual-rtl.css
+++ b/core/modules/contextual/contextual-rtl.css
@@ -1,4 +1,8 @@
-
+/**
+ * @file
+ * Stylesheet specific to right-to-left languages.
+ */
+ 
 div.contextual-links-wrapper {
   left: 5px;
   right: auto;
diff --git a/core/modules/contextual/contextual.css b/core/modules/contextual/contextual.css
index fd71514..3829328 100644
--- a/core/modules/contextual/contextual.css
+++ b/core/modules/contextual/contextual.css
@@ -1,3 +1,7 @@
+/**
+ * @file
+ * Stylesheet for the Contextual module.
+ */
 
 /**
  * Contextual links regions.
diff --git a/core/modules/contextual/contextual.js b/core/modules/contextual/contextual.js
index ee5b7a0..ebe5091 100644
--- a/core/modules/contextual/contextual.js
+++ b/core/modules/contextual/contextual.js
@@ -1,9 +1,14 @@
+/**
+ * @file
+ * Attaches behaviors for the Contextual module.
+ */
+
 (function ($) {
 
 Drupal.contextualLinks = Drupal.contextualLinks || {};
 
 /**
- * Attach outline behavior for regions associated with contextual links.
+ * Attaches outline behavior for regions associated with contextual links.
  */
 Drupal.behaviors.contextualLinks = {
   attach: function (context) {
diff --git a/core/modules/contextual/contextual.module b/core/modules/contextual/contextual.module
index e3c0f8b..7b14a3f 100644
--- a/core/modules/contextual/contextual.module
+++ b/core/modules/contextual/contextual.module
@@ -77,7 +77,7 @@ function contextual_element_info() {
 }
 
 /**
- * Template variable preprocessor for contextual links.
+ * Implements hook_preprocess().
  *
  * @see contextual_pre_render_links()
  */
@@ -114,7 +114,7 @@ function contextual_preprocess(&$variables, $hook) {
 }
 
 /**
- * Build a renderable array for contextual links.
+ * Pre-render callback: Builds a renderable array for contextual links.
  *
  * @param $element
  *   A renderable array containing a #contextual_links property, which is a
@@ -132,6 +132,7 @@ function contextual_preprocess(&$variables, $hook) {
  *   A renderable array representing contextual links.
  *
  * @see menu_contextual_links()
+ * @see contextual_element_info()
  */
 function contextual_pre_render_links($element) {
   // Retrieve contextual menu links.