diff --git a/README.md b/README.md
index 91a2c88092..55f599235e 100644
--- a/README.md
+++ b/README.md
@@ -124,6 +124,8 @@ psql postgres -c "create database calckey with encoding = 'UTF8';"
 - To add custom CSS for all users, edit `./custom/assets/instance.css`.
 - To add static assets (such as images for the splash screen), place them in the `./custom/assets/` directory. They'll then be available on `https://yourinstance.tld/static-assets/filename.ext`.
 - To add custom locales, place them in the `./custom/locales/` directory. If you name your custom locale the same as an existing locale, it will overwrite it. If you give it a unique name, it will be added to the list. Also make sure that the first part of the filename matches the locale you're basing it on. (Example: `en-FOO.yml`)
+- To add custom error images, place them in the `./custom/assets/badges` directory, replacing the files already there.
+- To add custom sounds, place only mp3 files in the `./custom/assets/sounds` directory.
 - To update custom assets without rebuilding, just run `pnpm run gulp`.
 
 ## 🧑‍🔬 Configuring a new instance
diff --git a/custom/assets/badges/error.png b/custom/assets/badges/error.png
new file mode 100644
index 0000000000..e90912b405
Binary files /dev/null and b/custom/assets/badges/error.png differ
diff --git a/custom/assets/badges/info.png b/custom/assets/badges/info.png
new file mode 100644
index 0000000000..ac70544e4a
Binary files /dev/null and b/custom/assets/badges/info.png differ
diff --git a/custom/assets/badges/not-found.png b/custom/assets/badges/not-found.png
new file mode 100644
index 0000000000..73d611e0e1
Binary files /dev/null and b/custom/assets/badges/not-found.png differ
diff --git a/packages/backend/assets/sounds/None.mp3 b/custom/assets/sounds/None.mp3
similarity index 100%
rename from packages/backend/assets/sounds/None.mp3
rename to custom/assets/sounds/None.mp3
diff --git a/packages/backend/src/remote/activitypub/models/note.ts b/packages/backend/src/remote/activitypub/models/note.ts
index e643e24c9f..10ab5c66f5 100644
--- a/packages/backend/src/remote/activitypub/models/note.ts
+++ b/packages/backend/src/remote/activitypub/models/note.ts
@@ -128,20 +128,21 @@ export async function createNote(
 	// Skip if note is made before 2007 (1yr before Fedi was created)
 	// OR skip if note is made 3 days in advance
 	if (note.published) {
-		const DateChecker = new Date(note.published)
-		const FutureCheck = new Date()
-		FutureCheck.setDate(FutureCheck.getDate() + 3) // Allow some wiggle room for misconfigured hosts
+		const DateChecker = new Date(note.published);
+		const FutureCheck = new Date();
+		FutureCheck.setDate(FutureCheck.getDate() + 3); // Allow some wiggle room for misconfigured hosts
 		if (DateChecker.getFullYear() < 2007) {
-			logger.warn('Note somehow made before Activitypub was created; discarding');
+			logger.warn(
+				"Note somehow made before Activitypub was created; discarding",
+			);
 			return null;
 		}
 		if (DateChecker > FutureCheck) {
-			logger.warn('Note somehow made after today; discarding')
+			logger.warn("Note somehow made after today; discarding");
 			return null;
 		}
 	}
 
-
 	// Fetch author
 	const actor = (await resolvePerson(
 		getOneApId(note.attributedTo),
diff --git a/packages/backend/src/server/api/endpoints.ts b/packages/backend/src/server/api/endpoints.ts
index 35ab738a24..7fb5fd3209 100644
--- a/packages/backend/src/server/api/endpoints.ts
+++ b/packages/backend/src/server/api/endpoints.ts
@@ -669,7 +669,7 @@ const eps = [
 	["users/stats", ep___users_stats],
 	["admin/drive-capacity-override", ep___admin_driveCapOverride],
 	["fetch-rss", ep___fetchRss],
-	["get-sounds", ep___sounds]
+	["get-sounds", ep___sounds],
 ];
 
 export interface IEndpointMeta {
diff --git a/packages/backend/src/server/api/endpoints/get-sounds.ts b/packages/backend/src/server/api/endpoints/get-sounds.ts
index aa3ef24e7e..f7edd38609 100644
--- a/packages/backend/src/server/api/endpoints/get-sounds.ts
+++ b/packages/backend/src/server/api/endpoints/get-sounds.ts
@@ -14,15 +14,17 @@ export const paramDef = {
 } as const;
 
 export default define(meta, paramDef, async () => {
-	const music_files: (string|null)[] = [null, ];
-	const directory = (await readdir('./assets/sounds', { withFileTypes: true }))
-		.filter(potentialFolder => potentialFolder.isDirectory())
+	const music_files: (string | null)[] = [null];
+	const directory = (
+		await readdir("./assets/sounds", { withFileTypes: true })
+	).filter((potentialFolder) => potentialFolder.isDirectory());
 	for await (const folder of directory) {
-		const files = (await readdir(`./assets/sounds/${folder.name}`))
-		.filter(potentialSong => potentialSong.endsWith('.mp3'))
+		const files = (await readdir(`./assets/sounds/${folder.name}`)).filter(
+			(potentialSong) => potentialSong.endsWith(".mp3"),
+		);
 		for await (const file of files) {
-			music_files.push(`${folder.name}/${file.replace('.mp3','')}`);
+			music_files.push(`${folder.name}/${file.replace(".mp3", "")}`);
 		}
 	}
-	return music_files
+	return music_files;
 });
diff --git a/packages/backend/src/server/api/index.ts b/packages/backend/src/server/api/index.ts
index 1897059037..6d02ad0ab5 100644
--- a/packages/backend/src/server/api/index.ts
+++ b/packages/backend/src/server/api/index.ts
@@ -61,10 +61,12 @@ router.use(
 	}),
 );
 
-mastoRouter.use(koaBody({ 
-	multipart: true,
-	urlencoded: true
-}));
+mastoRouter.use(
+	koaBody({
+		multipart: true,
+		urlencoded: true,
+	}),
+);
 
 apiMastodonCompatible(mastoRouter);
 
diff --git a/packages/backend/src/server/index.ts b/packages/backend/src/server/index.ts
index cd495971ef..efdd746ee1 100644
--- a/packages/backend/src/server/index.ts
+++ b/packages/backend/src/server/index.ts
@@ -72,9 +72,11 @@ app.use(mount("/proxy", proxyServer));
 const router = new Router();
 const mastoRouter = new Router();
 
-mastoRouter.use(koaBody({ 
-	urlencoded: true
-}));
+mastoRouter.use(
+	koaBody({
+		urlencoded: true,
+	}),
+);
 
 // Routing
 router.use(activityPub.routes());
@@ -159,9 +161,9 @@ mastoRouter.post("/oauth/token", async (ctx) => {
 			ctx.body = { error: "Invalid code" };
 			return;
 		}
-	} 
+	}
 	if (client_id instanceof Array) {
-		client_id = client_id.toString();;
+		client_id = client_id.toString();
 	} else if (!client_id) {
 		client_id = null;
 	}
@@ -169,7 +171,7 @@ mastoRouter.post("/oauth/token", async (ctx) => {
 		const atData = await client.fetchAccessToken(
 			client_id,
 			body.client_secret,
-			m ? m[0] : '',
+			m ? m[0] : "",
 		);
 		ctx.body = {
 			access_token: atData.accessToken,