diff --git a/src/local.ts b/src/local.ts
index 068a705..ba7ea3a 100644
--- a/src/local.ts
+++ b/src/local.ts
@@ -1,16 +1,20 @@
-import { resolve } from "path";
+import { resolve } from "path"; // Import 'resolve' to construct absolute file paths
 
+// Define an asynchronous function to set up environment variables and run the main script
 async function run() {
+  // Map environment variables to GitHub Action input format
   [
-    ["github-token", "GITHUB_TOKEN"],
-    ["merge-method", "MERGE_METHOD"],
+    ["github-token", "GITHUB_TOKEN"], // Maps GITHUB_TOKEN to INPUT_GITHUB_TOKEN
+    ["merge-method", "MERGE_METHOD"], // Maps MERGE_METHOD to INPUT_MERGE_METHOD
   ].forEach(([inputName, envInputVariable]) => {
+    // If the environment variable exists, convert and assign it as a GitHub Action input
     if (process.env[envInputVariable]) {
       process.env[`INPUT_${inputName.replace(/ /g, "_").toUpperCase()}`] =
         process.env[envInputVariable];
     }
   });
 
+  // Set the GitHub event path to a stub JSON file (simulating a pull request event)
   process.env[`GITHUB_EVENT_PATH`] = resolve(
     __dirname,
     "..",
@@ -18,7 +22,9 @@ async function run() {
     "example-pull-request.json",
   );
 
+  // Load and execute the main script
   require("./main");
 }
 
+// Run the setup function
 run();