child theme

Hi sir, THank you for everything. you are so kind and helpful. Please, i created child theme folder , and this folder have only one file(style.css). My question is : If i will update my theme(catch-box) what will happen to my blog ? /* Theme Name: Ashraf Theme URI: http://catchthemes.com/themes/catchbox Author: Catch Themes Team Author URI: http://catchthemes.com Template: catch-box Description: Catch Box Child Theme Version: 1.0 License: GNU General Public License v2 or later License URI: http://www.gnu.org/licenses/gpl-2.0.html Tags: dark, light, white, black, gray, one-column, two-columns, left-sidebar, right-sidebar, fixed-width, flexible-width, custom-background, custom-colors, custom-header, custom-menu, editor-style, featured-image-header, featured-images, full-width-template, microformats, post-formats, rtl-language-support, sticky-post, theme-options, translation-ready */ @import url('../catch-box/style.css');