diff --git a/public/language/en-GB/admin/manage/categories.json b/public/language/en-GB/admin/manage/categories.json
index 9965edf634..f51152f22d 100644
--- a/public/language/en-GB/admin/manage/categories.json
+++ b/public/language/en-GB/admin/manage/categories.json
@@ -10,6 +10,9 @@
 	"handle": "Category Handle",
 	"handle.help": "Your category handle is used as a representation of this category across other networks, similar to a username. A category handle must not match an existing username or user group.",
 	"description": "Category Description",
+	"federatedDescription": "Federated Description",
+	"federatedDescription.help": "This text will be appended to the category description when queried by other websites/apps.",
+	"federatedDescription.default": "This is a forum category containing topical discussion. You can start new discussions by mentioning this category.",
 	"bg-color": "Background Colour",
 	"text-color": "Text Colour",
 	"bg-image-size": "Background Image Size",
diff --git a/src/activitypub/mocks.js b/src/activitypub/mocks.js
index 290ab13fc8..9ca0968b68 100644
--- a/src/activitypub/mocks.js
+++ b/src/activitypub/mocks.js
@@ -413,10 +413,11 @@ Mocks.actors.user = async (uid) => {
 };
 
 Mocks.actors.category = async (cid) => {
-	const {
+	let {
 		name, handle: preferredUsername, slug,
-		descriptionParsed: summary, backgroundImage,
-	} = await categories.getCategoryData(cid);
+		descriptionParsed: summary, federatedDescription, backgroundImage,
+	} = await categories.getCategoryFields(cid,
+		['name', 'handle', 'slug', 'description', 'descriptionParsed', 'federatedDescription', 'backgroundImage']);
 	const publicKey = await activitypub.getPublicKey('cid', cid);
 
 	let icon;
@@ -437,6 +438,9 @@ Mocks.actors.category = async (cid) => {
 		};
 	}
 
+	// Append federated desc.
+	const fallback = await translator.translate('[[admin/manage/categories:federatedDescription.default]]');
+	summary += `<hr /><p dir="auto">${federatedDescription || fallback}</p>\n`;
 
 	return {
 		'@context': [
diff --git a/src/categories/data.js b/src/categories/data.js
index 8890abf670..9ad2783203 100644
--- a/src/categories/data.js
+++ b/src/categories/data.js
@@ -117,7 +117,7 @@ function modifyCategory(category, fields) {
 
 	db.parseIntFields(category, intFields, fields);
 
-	const escapeFields = ['name', 'color', 'bgColor', 'backgroundImage', 'imageClass', 'class', 'link'];
+	const escapeFields = ['name', 'description', 'federatedDescription', 'color', 'bgColor', 'backgroundImage', 'imageClass', 'class', 'link'];
 	escapeFields.forEach((field) => {
 		if (category.hasOwnProperty(field)) {
 			category[field] = validator.escape(String(category[field] || ''));
@@ -137,7 +137,6 @@ function modifyCategory(category, fields) {
 	}
 
 	if (category.description) {
-		category.description = validator.escape(String(category.description));
 		category.descriptionParsed = category.descriptionParsed || category.description;
 	}
 }
diff --git a/src/views/admin/manage/category.tpl b/src/views/admin/manage/category.tpl
index f57c6ab463..5d3b84c639 100644
--- a/src/views/admin/manage/category.tpl
+++ b/src/views/admin/manage/category.tpl
@@ -36,6 +36,16 @@
 					<textarea id="cid-{category.cid}-description" data-name="description" class="form-control category_description description" rows="4" />{category.description}</textarea>
 				</div>
 
+				<div class="mb-3">
+					<label class="form-label" for="cid-{category.cid}-federatedDescription">
+						[[admin/manage/categories:federatedDescription]]
+					</label>
+					<textarea id="cid-{category.cid}-federatedDescription" data-name="federatedDescription" class="form-control" rows="2" placeholder="[[admin/manage/categories:federatedDescription.default]]" />{category.federatedDescription}</textarea>
+					<p class="form-text">
+						[[admin/manage/categories:federatedDescription.help]]
+					</p>
+				</div>
+
 				<div class="mb-3 d-flex justify-content-between align-items-center gap-2">
 					<label class="form-label" for="cid-{category.cid}-parentCid">[[admin/manage/categories:parent-category]]</label>
 					<div id="parent-category-selector">