add comment

Author: mydea

dev-packages/node-overhead-gh-action/index.mjs

@@ -120,7 +120,10 @@ async function run() {
     const shouldComment = isNaN(thresholdNumber) || hasChanges(base, current, thresholdNumber) || nodeOverheadComment;
 
     if (shouldComment) {
-      const bodyParts = [NODE_OVERHEAD_HEADING];
+      const bodyParts = [
+        NODE_OVERHEAD_HEADING,
+        'Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.',
+      ];
 
       if (baseIsNotLatest) {
         bodyParts.push(