diff --git a/.esbuild/build.ts b/.esbuild/build.ts
index 3b34b8b44..28b841341 100644
--- a/.esbuild/build.ts
+++ b/.esbuild/build.ts
@@ -56,6 +56,7 @@ const main = async () => {
   generateLangium();
   await mkdir('stats').catch(() => {});
   const packageNames = Object.keys(packageOptions) as (keyof typeof packageOptions)[];
+  // it should build `parser` before `mermaid` because it's a dependecy
   for (const pkg of packageNames) {
     await buildPackage(pkg).catch(handler);
   }