diff --git a/tools/doc/html.js b/tools/doc/html.js
index 1bb5fa630fa8c2..7712290b4c61ed 100644
--- a/tools/doc/html.js
+++ b/tools/doc/html.js
@@ -168,6 +168,7 @@ function altDocs(filename) {
   }
 
   const versions = [
+    { num: '10.x' },
     { num: '9.x' },
     { num: '8.x', lts: true },
     { num: '7.x' },