diff --git a/tools/build_node.js b/tools/build_node.js
index 3e1e0432e3..2d6c511a67 100644
--- a/tools/build_node.js
+++ b/tools/build_node.js
@@ -45,7 +45,7 @@ async function buildNodeLanguage(language, options) {
     if (!emitWarning.warned) {
       emitWarning.warned = true;
       process.emitWarning(
-        'Using file extension in specifier is deprecated, use "highlight.js/lib/languages/%%%%" instead',
+        'Using file extension in specifier is deprecated, use "highlight.js/lib/languages/%%%%" instead of "highlight.js/lib/languages/%%%%.js"',
         'DeprecationWarning'
       );
     }