diff --git a/docs/concepts/10-serializing.md b/docs/concepts/10-serializing.md
index f71d3478a..d7d2bc63f 100644
--- a/docs/concepts/10-serializing.md
+++ b/docs/concepts/10-serializing.md
@@ -173,7 +173,7 @@ const deserialize = (el, markAttributes = {}) => {
 
   // define attributes for text nodes
   switch (el.nodeName) {
-    case 'strong':
+    case 'STRONG':
       nodeAttributes.bold = true
   }