diff --git a/stylesheets/headings.scss b/stylesheets/headings.scss
index da7ed7f056..4620b5e29b 100644
--- a/stylesheets/headings.scss
+++ b/stylesheets/headings.scss
@@ -30,6 +30,12 @@ h3 {
   h3 {
     font-size: 1em;
   }
+  h4 {
+    font-size: 0.875em;
+  }
+  h5 {
+    font-size: 0.85em;
+  }
 }
 
 // needs specificity to override