diff --git a/src/types/index.ts b/src/types/index.ts
index caa4a56..5fb15cb 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -214,6 +214,14 @@ export interface TariffPeriod {
   price_label: string
   price_per_month_kopeks: number
   price_per_month_label: string
+  // Discount info (if promo group discount applied)
+  original_price_kopeks?: number
+  original_price_label?: string
+  original_per_month_kopeks?: number
+  original_per_month_label?: string
+  discount_percent?: number
+  discount_amount_kopeks?: number
+  discount_label?: string
 }
 
 export interface TariffServer {
@@ -254,6 +262,14 @@ export interface Tariff {
   // Daily tariff options
   is_daily?: boolean
   daily_price_kopeks?: number
+  // Promo group discount info
+  promo_group_name?: string
+  original_device_price_kopeks?: number
+  device_discount_percent?: number
+  original_daily_price_kopeks?: number
+  daily_discount_percent?: number
+  original_price_per_day_kopeks?: number
+  custom_days_discount_percent?: number
 }
 
 export interface TariffsPurchaseOptions {