diff --git a/bin/one-time/add-quest-sync-info b/bin/one-time/add-quest-sync-info
new file mode 100755
index 0000000..bf63da9
--- /dev/null
+++ b/bin/one-time/add-quest-sync-info
@@ -0,0 +1,60 @@
+#!/usr/bin/env -S node --env-file-if-exists=.env
+// Adds `quest-sync` parameters to quest infoboxes that don't have them
+
+import { findEDBQuestSync } from '../../lib/api/lodestone.js';
+import {getMediawikiClient} from '../../lib/config.js';
+import {diff} from '../../lib/util/diff.js';
+import { addParameterBesideExistingParameter } from '../../lib/util/template-parameters.js';
+
+const mw = await getMediawikiClient();
+
+const allquestcats = `
+Category:Main Scenario quests
+Category:Side Story quests
+Category:Guildleves
+Category:Sidequests
+Category:other quests
+Category:Daily quests
+Category:Feature quests
+Category:Repeatable Feature quests
+Category:Quasi-quests
+Category:Feature quasi-quests
+Category:Quests with no type specified
+`.split('\n').filter(s => s);
+console.log(allquestcats)
+
+const pages = (await Promise.all(allquestcats.map(category => mw.listCategoryPages(category, [0], 'max')))).flat();
+
+console.log(pages.length);
+
+function insertQuestSync (pageContent) {
+	if (pageContent.includes('quest-sync')) {
+		throw new Error('Page already contains a `quest-sync` parameter');
+	}
+	let result = addParameterBesideExistingParameter(pageContent, 'quest-sync', 'true', 'after', 'level');
+	if (result == null) throw new Error('Failed to add parameter');
+	return result;
+}
+
+const start = parseInt(process.env.START ?? '0', 10);
+if (start) {
+	console.log('Starting from item index', start);
+	pages.splice(0, start);
+}
+
+for (const [i, {title}] of Object.entries(pages)) {
+	console.log(start+parseInt(i), title);
+	const content = await mw.readPage(title);
+	const hasQuestSync = await findEDBQuestSync(title.replace(' (Quest)', ''));
+	if (!hasQuestSync) continue;
+	let newContent;
+	try {
+		newContent = insertQuestSync(content);
+	} catch (error) {
+		console.error(error);
+		continue;
+	}
+	diff(content, newContent);
+
+	await mw.editPage(title, newContent, 'Add quest-sync parameter', true);
+}