diff --git a/css-sizing-4/responsive-iframes-explainer.md b/css-sizing-4/responsive-iframes-explainer.md
index 6373c42c56c4..a1c0912328f7 100644
--- a/css-sizing-4/responsive-iframes-explainer.md
+++ b/css-sizing-4/responsive-iframes-explainer.md
@@ -1,4 +1,4 @@
-# Responsive iframes
+# Responsively-sized iframes
 
 ## Problem description