diff --git a/docs/walkthroughs/04-applying-custom-formatting.md b/docs/walkthroughs/04-applying-custom-formatting.md
index d4a991b2b..5177d784a 100644
--- a/docs/walkthroughs/04-applying-custom-formatting.md
+++ b/docs/walkthroughs/04-applying-custom-formatting.md
@@ -108,7 +108,7 @@ const Leaf = props => {
   return (
     <span
       {...props.attributes}
-      style={{ fontWeight: leaf.bold ? 'bold' : 'normal' }}
+      style={{ fontWeight: props.leaf.bold ? 'bold' : 'normal' }}
     >
       {props.children}
     </span>
@@ -181,7 +181,7 @@ const Leaf = props => {
   return (
     <span
       {...props.attributes}
-      style={{ fontWeight: leaf.bold ? 'bold' : 'normal' }}
+      style={{ fontWeight: props.leaf.bold ? 'bold' : 'normal' }}
     >
       {props.children}
     </span>