diff --git a/includes/class-displayfeaturedimagegenesis-common.php b/includes/class-displayfeaturedimagegenesis-common.php
index 6cacd57..c4af096 100644
--- a/includes/class-displayfeaturedimagegenesis-common.php
+++ b/includes/class-displayfeaturedimagegenesis-common.php
@@ -35,6 +35,11 @@ class Display_Featured_Image_Genesis_Common {
 		add_filter( 'jetpack_photon_override_image_downsize', '__return_true' ); // turn Photon off so we can get the correct image
 
 		$image_size = 'displayfeaturedimage_backstretch';
+		/**
+		 * Creates display_featured_image_genesis_use_large_image filter to check
+		 * whether get_post_type array should use large image instead of backstretch.
+		 * @uses is_in_array()
+		 */
 		if ( self::is_in_array( 'use_large_image' ) ) {
 			$image_size = 'large';
 		}
@@ -94,6 +99,11 @@ class Display_Featured_Image_Genesis_Common {
 
 		// set here with fallback preemptively, if it exists
 		if ( ! empty( $fallback ) ) {
+			/**
+			 * Creates display_featured_image_genesis_use_default filter to check
+			 * whether get_post_type array should use default image.
+			 * @uses is_in_array()
+			 */
 			$image_id = $fallback_id;
 			if ( self::is_in_array( 'use_default' ) ) {
 				return (int) $image_id;
@@ -112,6 +122,11 @@ class Display_Featured_Image_Genesis_Common {
 		// if a post type image exists, it takes priority over the fallback. check that next.
 		$post_type = get_post_type();
 		if ( ! empty( $displaysetting['post_type'][ $post_type ] ) ) {
+			/**
+			 * Creates display_featured_image_genesis_use_post_type_image filter to check
+			 * whether get_post_type array should use the post type image.
+			 * @uses is_in_array()
+			 */
 			$image_id = displayfeaturedimagegenesis_check_image_id( $displaysetting['post_type'][ $post_type ] );
 			if ( self::is_in_array( 'use_post_type_image' ) ) {
 				return (int) $image_id;
@@ -134,6 +149,11 @@ class Display_Featured_Image_Genesis_Common {
 
 			$term_image = display_featured_image_genesis_get_term_image_id();
 			if ( ! empty( $term_image ) ) {
+				/**
+				 * Creates display_featured_image_genesis_use_taxonomy filter to check
+				 * whether get_post_type array should use the term image.
+				 * @uses is_in_array()
+				 */
 				$image_id = $term_image;
 				if ( self::is_in_array( 'use_taxonomy' ) ) {
 					return (int) $image_id;
diff --git a/includes/class-displayfeaturedimagegenesis-output.php b/includes/class-displayfeaturedimagegenesis-output.php
index 532b094..221add8 100644
--- a/includes/class-displayfeaturedimagegenesis-output.php
+++ b/includes/class-displayfeaturedimagegenesis-output.php
@@ -24,8 +24,12 @@ class Display_Featured_Image_Genesis_Output {
 		$settings             = new Display_Featured_Image_Genesis_Settings();
 		$this->displaysetting = $settings->get_display_setting();
 		$skip                 = $this->displaysetting['exclude_front'];
+		/**
+		 * Creates display_featured_image_genesis_skipped_posttypes filter to check
+		 * whether get_post_type array should not run plugin on this post type.
+		 * @uses is_in_array()
+		 */
 		$post_types           = array( 'attachment', 'revision', 'nav_menu_item' );
-
 		if ( is_admin() || ( Display_Featured_Image_Genesis_Common::is_in_array( 'skipped_posttypes', $post_types ) ) || ( $skip && is_front_page() ) ) {
 			return;
 		}
@@ -53,7 +57,11 @@ class Display_Featured_Image_Genesis_Output {
 
 		$large = $this->common->minimum_backstretch_width();
 		$width = absint( $this->item->backstretch[1] );
-
+		/**
+		 * Creates display_featured_image_genesis_force_backstretch filter to check
+		 * whether get_post_type array should force the backstretch effect for this post type.
+		 * @uses is_in_array()
+		 */
 		if ( $width > $large || Display_Featured_Image_Genesis_Common::is_in_array( 'force_backstretch' ) ) {
 			$this->do_backstretch_image_things();
 		} else {
@@ -303,6 +311,11 @@ class Display_Featured_Image_Genesis_Output {
 	 */
 	protected function move_excerpts() {
 		$move_excerpts = $this->displaysetting['move_excerpts'];
+		/**
+		 * Creates display_featured_image_genesis_omit_excerpt filter to check
+		 * whether get_post_type array should not move excerpts for this post type.
+		 * @uses is_in_array()
+		 */
 		if ( $move_excerpts && ! Display_Featured_Image_Genesis_Common::is_in_array( 'omit_excerpt' ) ) {
 			return true;
 		}
@@ -316,7 +329,11 @@ class Display_Featured_Image_Genesis_Output {
 	 */
 	protected function move_title() {
 		$keep_titles       = $this->displaysetting['keep_titles'];
-		// if titles will be moved to overlay backstretch image
+		/**
+		 * Creates display_featured_image_genesis_do_not_move_titles filter to check
+		 * whether get_post_type array should not move titles to overlay the featured image.
+		 * @uses is_in_array()
+		 */
 		if ( ! $keep_titles && ! Display_Featured_Image_Genesis_Common::is_in_array( 'do_not_move_titles' ) ) {
 			return true;
 		}
diff --git a/includes/class-displayfeaturedimagegenesis.php b/includes/class-displayfeaturedimagegenesis.php
index 4153830..45aede5 100644
--- a/includes/class-displayfeaturedimagegenesis.php
+++ b/includes/class-displayfeaturedimagegenesis.php
@@ -16,6 +16,66 @@
  */
 class Display_Featured_Image_Genesis {
 
+	/**
+	 * Admin area class: handles columns.
+	 * @var Display_Featured_Image_Genesis_Admin $admin
+	 */
+	protected $admin;
+
+	/**
+	 * Adds new author meta.
+	 * @var Display_Featured_Image_Genesis_Author $author
+	 */
+	protected $author;
+
+	/**
+	 * Common class: sets image ID, post title, handles database query
+	 * @var Display_Featured_Image_Genesis_Common $common
+	 */
+	protected $common;
+
+	/**
+	 * All archive description functions.
+	 * @var Display_Featured_Image_Genesis_Description $description
+	 */
+	protected $description;
+
+	/**
+	 * Handles all image output functionality
+	 * @var Display_Featured_Image_Genesis_Output $output
+	 */
+	protected $output;
+
+	/**
+	 * Handles RSS feed output
+	 * @var Display_Featured_Image_Genesis_RSS $rss
+	 */
+	protected $rss;
+
+	/**
+	 * Sets up settings page for the plugin.
+	 * @var Display_Featured_Image_Genesis_Settings $settings
+	 */
+	protected $settings;
+
+	/**
+	 * Handles term meta.
+	 * @var Display_Featured_Image_Genesis_Taxonomies $taxonomies
+	 */
+	protected $taxonomies;
+
+	/**
+	 * Display_Featured_Image_Genesis constructor.
+	 *
+	 * @param $admin
+	 * @param $author
+	 * @param $common
+	 * @param $description
+	 * @param $output
+	 * @param $rss
+	 * @param $settings
+	 * @param $taxonomies
+	 */
 	function __construct( $admin, $author, $common, $description, $output, $rss, $settings, $taxonomies ) {
 		$this->admin       = $admin;
 		$this->author      = $author;
@@ -27,6 +87,9 @@ class Display_Featured_Image_Genesis {
 		$this->taxonomies  = $taxonomies;
 	}
 
+	/**
+	 * Main plugin function. Starts up all the things.
+	 */
 	public function run() {
 		if ( 'genesis' !== basename( get_template_directory() ) ) {
 			add_action( 'admin_init', array( $this, 'deactivate' ) );