Index: wp-admin/includes/class-wp-media-list-table.php
===================================================================
--- wp-admin/includes/class-wp-media-list-table.php	(revision 25981)
+++ wp-admin/includes/class-wp-media-list-table.php	(working copy)
@@ -90,6 +90,11 @@
 		if ( 'top' == $which && !is_singular() && !$this->detached && !$this->is_trash ) {
 			$this->months_dropdown( 'attachment' );
 
+			/**
+			 * Fires before the filter button is rendered at the top of the attachment table
+			 *
+			 * @since 2.1.0
+			 */
 			do_action( 'restrict_manage_posts' );
 			submit_button( __( 'Filter' ), 'button', false, false, array( 'id' => 'post-query-submit' ) );
 		}
@@ -137,6 +142,14 @@
 		$taxonomies = get_taxonomies_for_attachments( 'objects' );
 		$taxonomies = wp_filter_object_list( $taxonomies, array( 'show_admin_column' => true ), 'and', 'name' );
 
+		/**
+		 * Filter attachment taxonomy columns
+		 *
+		 * @since 3.5.0
+		 *
+		 * @param array 	$taxonomies 	Array of registered taxonomies for attachments
+		 * @param string 	'attachment'	Post type
+		 */
 		$taxonomies = apply_filters( 'manage_taxonomies_for_attachment_columns', $taxonomies, 'attachment' );
 		$taxonomies = array_filter( $taxonomies, 'taxonomy_exists' );
 
@@ -159,6 +172,15 @@
 		}
 		/* translators: column name */
 		$posts_columns['date'] = _x( 'Date', 'column name' );
+
+		/**
+		 * Filter the columns for the media list table
+		 *
+		 * @since 2.5.0
+		 *
+		 * @param array $posts_columns 	Array of columns for the media table
+		 * @param bool 	$this->detached	Whether or not the table being shown contains unnatached media files
+		 */
 		$posts_columns = apply_filters( 'manage_media_columns', $posts_columns, $this->detached );
 
 		return $posts_columns;
@@ -383,6 +405,16 @@
 		}
 ?>
 		<td <?php echo $attributes ?>>
+			<?php
+				/**
+				 * Fires for each custom column that has been registered using the manage_media_columns filter
+				 *
+				 * @since 2.5.0
+				 *
+				 * @param string $column_name 	Name of the custom column
+				 * @param int 	 $post->ID    	Attachment id
+				 */
+			?>
 			<?php do_action( 'manage_media_custom_column', $column_name, $post->ID ); ?>
 		</td>
 <?php
@@ -430,6 +462,15 @@
 			}
 		}
 
+		/**
+		 * Filter the actions for each attachment row
+		 *
+		 * @since 2.8.0
+		 *
+		 * @param array 	$actions 		Array of actions that can be performed on each attachment
+		 * @param WP_Post 	$post 			Post object
+		 * @param bool 		$this->detached	Whether or not the table being shown contains unnatached media files
+		 */
 		$actions = apply_filters( 'media_row_actions', $actions, $post, $this->detached );
 
 		return $actions;