diff --git a/packages/google-cloud-aiplatform/tsconfig.json b/packages/google-cloud-aiplatform/tsconfig.json
index ba6c9134aff..7ae2f831377 100644
--- a/packages/google-cloud-aiplatform/tsconfig.json
+++ b/packages/google-cloud-aiplatform/tsconfig.json
@@ -1,4 +1,5 @@
 {
+  // This file is handwritten since this library has many custom handwritten files
   "extends": "./node_modules/gts/tsconfig-google.json",
   "compilerOptions": {
     "rootDir": ".",
diff --git a/packages/google-cloud-dns/tsconfig.json b/packages/google-cloud-dns/tsconfig.json
index 7537a0c1e40..a4a3252cda6 100644
--- a/packages/google-cloud-dns/tsconfig.json
+++ b/packages/google-cloud-dns/tsconfig.json
@@ -1,4 +1,5 @@
 {
+  // This file is handwritten since this library is also handwritten
   "extends": "./node_modules/gts/tsconfig-google.json",
   "compilerOptions": {
     "lib": [
diff --git a/packages/google-cloud-tasks/tsconfig.json b/packages/google-cloud-tasks/tsconfig.json
index 110f6eccd41..a51f848f091 100644
--- a/packages/google-cloud-tasks/tsconfig.json
+++ b/packages/google-cloud-tasks/tsconfig.json
@@ -1,4 +1,5 @@
 {
+  // This file is handwritten since this library has a dual-publication setup (ESM and CJS)
   "extends": "./node_modules/gts/tsconfig-google.json",
   "compilerOptions": {
     "rootDir": ".",
diff --git a/packages/typeless-sample-bot/tsconfig.json b/packages/typeless-sample-bot/tsconfig.json
index 58c531b461e..695d9e5159b 100644
--- a/packages/typeless-sample-bot/tsconfig.json
+++ b/packages/typeless-sample-bot/tsconfig.json
@@ -1,4 +1,5 @@
 {
+  // This file is handwritten since this library is also handwritten
   "extends": "./node_modules/gts/tsconfig-google.json",
   "include": [
     "src/*.ts",