diff --git a/apps/frontend/src/frontend.ts b/apps/frontend/src/frontend.ts
index 3482d7b..03705f2 100644
--- a/apps/frontend/src/frontend.ts
+++ b/apps/frontend/src/frontend.ts
@@ -1,8 +1,10 @@
 // @ts-ignore
 import gleamHljs from '@gleam-lang/highlight.js-gleam'
 import hljs from 'highlight.js/lib/core'
+import plaintext from 'highlight.js/lib/languages/plaintext'
 // @ts-ignore
 import { main } from './frontend.gleam'
 
 hljs.registerLanguage('gleam', gleamHljs)
+hljs.registerLanguage('plaintext', plaintext)
 document.addEventListener('DOMContentLoaded', main)
diff --git a/apps/frontend/src/markdown.ffi.mjs b/apps/frontend/src/markdown.ffi.mjs
index 14429f9..7b4d52d 100644
--- a/apps/frontend/src/markdown.ffi.mjs
+++ b/apps/frontend/src/markdown.ffi.mjs
@@ -6,7 +6,7 @@ import { markedHighlight } from 'marked-highlight'
 const parser = new Marked(
   markedHighlight({
     langPrefix: 'hljs language-',
-    highlight(code, lang, info) {
+    highlight(code, lang, _info) {
       const language = hljs.getLanguage(lang) ? lang : 'plaintext'
       return hljs.highlight(code, { language }).value
     },