diff --git a/tools/doc/html.js b/tools/doc/html.js
index 510e2b08d22..6336b32ebe3 100644
--- a/tools/doc/html.js
+++ b/tools/doc/html.js
@@ -394,6 +394,7 @@ function altDocs(filename, docCreated) {
   const [, docCreatedMajor, docCreatedMinor] = docCreated.map(Number);
   const host = 'https://nodejs.org';
   const versions = [
+    { num: '12.x' },
     { num: '11.x' },
     { num: '10.x', lts: true },
     { num: '9.x' },