diff --git a/modernize.css b/modernize.css
index 2768db4..05d9ecb 100644
--- a/modernize.css
+++ b/modernize.css
@@ -46,12 +46,11 @@ h1 {
    ========================================================================== */
 
 /**
- * 1. Add the correct box sizing in Firefox.
+ * 1. Add the correct height in Firefox.
  * 2. Show the overflow in Edge and IE.
  */
 
 hr {
-  box-sizing: content-box; /* 1 */
   height: 0; /* 1 */
   overflow: visible; /* 2 */
 }