diff --git a/core/themes/bartik/bartik.info b/core/themes/bartik/bartik.info
index c0c206d..ec51b9c 100644
--- a/core/themes/bartik/bartik.info
+++ b/core/themes/bartik/bartik.info
@@ -4,6 +4,10 @@ package = Core
 version = VERSION
 core = 8.x
 
+breakpoints[mobile] = (min-width: 0px)
+breakpoints[narrow] = all and (min-width: 560px) and (max-width:850px)
+breakpoints[wide] = all and (min-width: 851px)
+
 stylesheets[all][] = css/layout.css
 stylesheets[all][] = css/style.css
 stylesheets[all][] = css/colors.css