diff --git a/client/app/[username]/page.jsx b/client/app/[username]/page.jsx
index 1188a0c..f3c0326 100644
--- a/client/app/[username]/page.jsx
+++ b/client/app/[username]/page.jsx
@@ -1,3 +1,14 @@
+/* client/app/[username]/page.jsx
+ * GenAI Usage Note: When implementing the gallery page to fetch and display user posts based
+ * on the URL username, I used Copilot to understand how to structure the data fetching logic.
+ * Example prompts: "How do I fetch user data and their posts from an API endpoint using
+ * the username from the URL params?" and "What's the best way to handle loading states and
+ * error handling when fetching multiple API endpoints in a useEffect?" I reviewed the React
+ * documentation on useEffect cleanup and implemented a mounted flag to prevent state updates
+ * after component unmount. I also structured the fetch calls to first get the user profile,
+ * then fetch their posts and scrapbooks, ensuring proper error handling for 404 cases.
+ */
+
 "use client";
 
 import { Suspense, useState, useEffect } from "react";
diff --git a/client/app/account/page.jsx b/client/app/account/page.jsx
index 4a30174..4fbb3cb 100644
--- a/client/app/account/page.jsx
+++ b/client/app/account/page.jsx
@@ -1,3 +1,13 @@
+/* client/app/account/page.jsx
+ * GenAI Usage Note: When adding profile picture upload functionality, I used Copilot to
+ * understand how to integrate UploadThing's UploadButton component. Example prompts: "How do
+ * I use UploadThing's UploadButton component in a Next.js app?" and "How do I handle the
+ * onClientUploadComplete callback to save the uploaded image URL to my backend?" I reviewed
+ * the UploadThing documentation and implemented the handleProfilePictureUpload function to
+ * immediately save the profile picture URL to the backend after upload completes, ensuring
+ * the UI updates in real-time.
+ */
+
 "use client";
 import Link from "next/link";
 import Image from "next/image";
diff --git a/client/app/api/uploadthing/core.js b/client/app/api/uploadthing/core.js
index 8f94eaf..3f3c113 100644
--- a/client/app/api/uploadthing/core.js
+++ b/client/app/api/uploadthing/core.js
@@ -1,3 +1,13 @@
+/* client/app/api/uploadthing/core.js
+ * GenAI Usage Note: When adding the profile picture uploader endpoint, I used Copilot to
+ * understand how to create a new FileRoute in UploadThing. Example prompts: "How do I add
+ * a second file uploader endpoint in UploadThing with different settings?" and "What's the
+ * difference between file.url and file.ufsUrl in UploadThing?" I reviewed the UploadThing
+ * documentation and configured the profilePictureUploader with maxFileSize: "5MB" and
+ * maxFileCount: 1, and updated the console.log to use file.ufsUrl instead of the deprecated
+ * file.url property.
+ */
+
 import { createUploadthing } from "uploadthing/next";
 import { UploadThingError } from "uploadthing/server";
 
diff --git a/client/app/feed/components/likesDialog.module.css b/client/app/feed/components/likesDialog.module.css
index 05a765b..bed3448 100644
--- a/client/app/feed/components/likesDialog.module.css
+++ b/client/app/feed/components/likesDialog.module.css
@@ -5,9 +5,9 @@
  * I did some research on what @keyframes does, and once I understood it, I came to the conclusion
  * that it would be best to use it here.
  * I reviewed the keyframe animations and adjusted duration values to ensure
- * the transitions felt natural and weren't too slow. 
+ * the transitions felt natural and weren't too slow.
  */
-
+ 
 .overlay {
   position: fixed;
   top: 0;
diff --git a/server/config/middleware.js b/server/config/middleware.js
index 8544a6d..9b81aa8 100644
--- a/server/config/middleware.js
+++ b/server/config/middleware.js
@@ -1,3 +1,13 @@
+/* server/config/middleware.js
+ * GenAI Usage Note: When fixing a CORS error where requests without an Origin header were
+ * being rejected, I asked Copilot: "How do I allow requests without an Origin header in CORS
+ * while still validating cross-origin requests?" The solution was to check if origin exists
+ * before validation - if no origin is present, allow the request (for same-origin requests
+ * and health checks), but if an origin is present, validate it against the allowed origins list.
+ * I reviewed the CORS middleware documentation to ensure this approach was secure and wouldn't
+ * allow unauthorized cross-origin requests.
+ */
+
 const cors = require("cors");
 const express = require("express");
 const session = require("express-session");
@@ -9,9 +19,7 @@ function setupMiddleware(app) {
   const allowedOrigins =
     process.env.NODE_ENV === "development"
       ? ["http://localhost:3000"]
-      : [
-          process.env.CLIENT_ORIGIN,
-        ].filter(Boolean); // Remove any undefined values
+      : [process.env.CLIENT_ORIGIN].filter(Boolean); // Remove any undefined values
 
   app.use(
     cors({
diff --git a/server/routes/posts.js b/server/routes/posts.js
index d2e5795..d91cfb7 100644
--- a/server/routes/posts.js
+++ b/server/routes/posts.js
@@ -12,20 +12,20 @@ const { ALLOWED_CATEGORIES } = require("../constants");
 async function updateScrapbookCoversAfterPostDeletion(deletedPost) {
   try {
     // Find scrapbooks that used this post's image as cover
-    const postImageUrls = (deletedPost.images || []).map(img => img.url);
+    const postImageUrls = (deletedPost.images || []).map((img) => img.url);
 
     if (postImageUrls.length === 0) return;
 
     // Find scrapbooks where the cover image matches any of this post's images
     const affectedScrapbooks = await Scrapbook.find({
       author: deletedPost.author,
-      coverImage: { $in: postImageUrls }
-    }).populate('posts');
+      coverImage: { $in: postImageUrls },
+    }).populate("posts");
 
     for (const scrapbook of affectedScrapbooks) {
       // Find a replacement post that's still in the scrapbook
-      const remainingPosts = scrapbook.posts.filter(p =>
-        p && !p._id.equals(deletedPost._id)
+      const remainingPosts = scrapbook.posts.filter(
+        (p) => p && !p._id.equals(deletedPost._id)
       );
 
       if (remainingPosts.length > 0) {
@@ -38,13 +38,18 @@ async function updateScrapbookCoversAfterPostDeletion(deletedPost) {
         }
       } else {
         // No posts left in scrapbook, set empty cover
-        scrapbook.coverImage = '';
+        scrapbook.coverImage = "";
         await scrapbook.save();
-        console.log(`[Scrapbook] Cleared cover for empty scrapbook "${scrapbook.title}"`);
+        console.log(
+          `[Scrapbook] Cleared cover for empty scrapbook "${scrapbook.title}"`
+        );
       }
     }
   } catch (error) {
-    console.error('[Scrapbook] Error updating covers after deletion:', error.message);
+    console.error(
+      "[Scrapbook] Error updating covers after deletion:",
+      error.message
+    );
   }
 }
 
@@ -298,7 +303,7 @@ router.get("/photo-locations", async (req, res) => {
 
     res.json({ success: true, photoLocations, count: photoLocations.length });
   } catch (error) {
-    console.error('Error extracting photo locations:', error);
+    console.error("Error extracting photo locations:", error);
     res.status(500).json({ success: false, error: error.message });
   }
 });
@@ -391,7 +396,7 @@ router.delete("/:postId", async (req, res) => {
     for (const image of post.images || []) {
       const url = image.url;
       // UploadThing URLs follow pattern: https://utfs.io/f/{fileKey}
-      if (url && url.includes('utfs.io/f/')) {
+      if (url && url.includes("utfs.io/f/")) {
         const match = url.match(/utfs\.io\/f\/([^/?]+)/);
         if (match && match[1]) {
           fileKeys.push(match[1]);
@@ -402,13 +407,15 @@ router.delete("/:postId", async (req, res) => {
     // Delete files from UploadThing if we found any keys
     if (fileKeys.length > 0) {
       try {
-        const { UTApi } = require('uploadthing/server');
+        const { UTApi } = require("uploadthing/server");
         const utapi = new UTApi();
         await utapi.deleteFiles(fileKeys);
-        console.log(`[UploadThing] Deleted ${fileKeys.length} file(s) for post ${postId}`);
+        console.log(
+          `[UploadThing] Deleted ${fileKeys.length} file(s) for post ${postId}`
+        );
       } catch (utError) {
         // Log but don't fail the deletion if UploadThing deletion fails
-        console.error('[UploadThing] Error deleting files:', utError.message);
+        console.error("[UploadThing] Error deleting files:", utError.message);
       }
     }