diff --git a/wp-admin/edit-form-advanced.php b/wp-admin/edit-form-advanced.php
index a4127fae4..25345e41c 100644
--- a/wp-admin/edit-form-advanced.php
+++ b/wp-admin/edit-form-advanced.php
@@ -35,35 +35,37 @@ $action = isset($action) ? $action : '';
 
 $messages = array();
 $messages['post'] = array(
-	'',
-	sprintf( __('Post updated. <a href="%s">View post</a>'), esc_url( get_permalink($post_ID) ) ),
-	__('Custom field updated.'),
-	__('Custom field deleted.'),
-	__('Post updated.'),
+	 0 => '', // Unused. Messages start at index 1.
+	 1 => sprintf( __('Post updated. <a href="%s">View post</a>'), esc_url( get_permalink($post_ID) ) ),
+	 2 => __('Custom field updated.'),
+	 3 => __('Custom field deleted.'),
+	 4 => __('Post updated.'),
 	/* translators: %s: date and time of the revision */
-	isset($_GET['revision']) ? sprintf( __('Post restored to revision from %s'), wp_post_revision_title( (int) $_GET['revision'], false ) ) : false,
-	sprintf( __('Post published. <a href="%s">View post</a>'), esc_url( get_permalink($post_ID) ) ),
-	__('Post saved.'),
-	sprintf( __('Post submitted. <a target="_blank" href="%s">Preview post</a>'), esc_url( add_query_arg( 'preview', 'true', get_permalink($post_ID) ) ) ),
-	sprintf( __('Post scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview post</a>'),
+	 5 => isset($_GET['revision']) ? sprintf( __('Post restored to revision from %s'), wp_post_revision_title( (int) $_GET['revision'], false ) ) : false,
+	 6 => sprintf( __('Post published. <a href="%s">View post</a>'), esc_url( get_permalink($post_ID) ) ),
+	 7 => __('Post saved.'),
+	 8 => sprintf( __('Post submitted. <a target="_blank" href="%s">Preview post</a>'), esc_url( add_query_arg( 'preview', 'true', get_permalink($post_ID) ) ) ),
+	 9 => sprintf( __('Post scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview post</a>'),
 		// translators: Publish box date format, see http://php.net/date
 		date_i18n( __( 'M j, Y @ G:i' ), strtotime( $post->post_date ) ), esc_url( get_permalink($post_ID) ) ),
-	sprintf( __('Post draft updated. <a target="_blank" href="%s">Preview post</a>'), esc_url( add_query_arg( 'preview', 'true', get_permalink($post_ID) ) ) ),
+	10 => sprintf( __('Post draft updated. <a target="_blank" href="%s">Preview post</a>'), esc_url( add_query_arg( 'preview', 'true', get_permalink($post_ID) ) ) ),
 );
 $messages['page'] = array(
-	'',
-	sprintf( __('Page updated. <a href="%s">View page</a>'), esc_url( get_permalink($post_ID) ) ),
-	__('Custom field updated.'),
-	__('Custom field deleted.'),
-	__('Page updated.'),
-	isset($_GET['revision']) ? sprintf( __('Page restored to revision from %s'), wp_post_revision_title( (int) $_GET['revision'], false ) ) : false,
-	sprintf( __('Page published. <a href="%s">View page</a>'), esc_url( get_permalink($post_ID) ) ),
-	__('Page saved.'),
-	sprintf( __('Page submitted. <a target="_blank" href="%s">Preview page</a>'), esc_url( add_query_arg( 'preview', 'true', get_permalink($post_ID) ) ) ),
-	sprintf( __('Page scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview page</a>'), date_i18n( __( 'M j, Y @ G:i' ), strtotime( $post->post_date ) ), esc_url( get_permalink($post_ID) ) ),
-	sprintf( __('Page draft updated. <a target="_blank" href="%s">Preview page</a>'), esc_url( add_query_arg( 'preview', 'true', get_permalink($post_ID) ) ) ),
+	 0 => '', // Unused. Messages start at index 1.
+	 1 => sprintf( __('Page updated. <a href="%s">View page</a>'), esc_url( get_permalink($post_ID) ) ),
+	 2 => __('Custom field updated.'),
+	 3 => __('Custom field deleted.'),
+	 4 => __('Page updated.'),
+	 5 => isset($_GET['revision']) ? sprintf( __('Page restored to revision from %s'), wp_post_revision_title( (int) $_GET['revision'], false ) ) : false,
+	 6 => sprintf( __('Page published. <a href="%s">View page</a>'), esc_url( get_permalink($post_ID) ) ),
+	 7 => __('Page saved.'),
+	 8 => sprintf( __('Page submitted. <a target="_blank" href="%s">Preview page</a>'), esc_url( add_query_arg( 'preview', 'true', get_permalink($post_ID) ) ) ),
+	 9 => sprintf( __('Page scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview page</a>'), date_i18n( __( 'M j, Y @ G:i' ), strtotime( $post->post_date ) ), esc_url( get_permalink($post_ID) ) ),
+	10 => sprintf( __('Page draft updated. <a target="_blank" href="%s">Preview page</a>'), esc_url( add_query_arg( 'preview', 'true', get_permalink($post_ID) ) ) ),
 );
 
+$messages = apply_filters( 'post_updated_messages', $messages );
+
 $message = false;
 if ( isset($_GET['message']) ) {
 	$_GET['message'] = absint( $_GET['message'] );