diff --git a/Extensions-index.md b/Extensions-index.md
index a78d943..5b17ce9 100644
--- a/Extensions-index.md
+++ b/Extensions-index.md
@@ -1,5 +1,11 @@
 {
 	"about": "This file is used by Web UI to show the index of available extensions. It's in JSON format and is not meant to be viewed by users directly. If you edit the file you must ensure that it's still a valid JSON.",
+	"tags": {
+		"script": "a general extension that adds functionality",
+		"localization": "a localization extension that translates web ui into another language",
+		"tab": "adds a tab",
+		"ads": "contains ads"
+	},
 	"extensions": [
 		{
 			"name": "Aesthetic Gradients",