diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3b01fcf..7f03a9d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 == HEAD
 
+* Normalize `h1` margin when within HTML5 sectioning elements.
 * Normalize `hr` element.
 * Remove unnecessary `pre` styles.
 * Add `main` element to HTML5 display definitions.
diff --git a/normalize.css b/normalize.css
index 6ad7071..0dd72b0 100644
--- a/normalize.css
+++ b/normalize.css
@@ -101,12 +101,13 @@ a:hover {
    ========================================================================== */
 
 /**
- * Address variable `h1` font size within `section` and `article` contexts in
- * Firefox 4+, Safari 5, and Chrome.
+ * Address variable `h1` font-size and margin within `section` and `article`
+ * contexts in Firefox 4+, Safari 5, and Chrome.
  */
 
 h1 {
     font-size: 2em;
+    margin: 0.67em 0;
 }
 
 /**