diff --git a/README.md b/README.md
index 21b96a3..ca07a77 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@
 |:-:  |:-:  |:-:  |:-:  |:-:  |:-:  |:-:  |:-:  |:-:  |
 | [#](#-companies)  | [A](#a-companies)  | [B](#b-companies)  | [C](#c-companies)  | [D](#d-companies)  | [](#e-companies)  | [](#f-companies)  | [G](#g-companies)  | [H](#h-companies)  |
 | [](#i-companies)  | [](#j-companies)  | [K](#k-companies)  | [L](#l-companies)  | [M](#m-companies)  | [N](#n-companies)  | [](#o-companies)  | [P](#p-companies)  | [Q](#q-companies)  |
-| [](#r-companies)  | [S](#s-companies)  | [T](#t-companies)  | [U](#u-companies)  | [V](#v-companies)  | [W](#w-companies)  | [](#x-companies)  | [Y](#y-companies)  | [Z](#z-companies)   |
+| [R](#r-companies)  | [S](#s-companies)  | [T](#t-companies)  | [U](#u-companies)  | [V](#v-companies)  | [W](#w-companies)  | [](#x-companies)  | [Y](#y-companies)  | [Z](#z-companies)   |
 
 
 #### [System Design Fundamentals](#System-Design-Fundamentals-1)
@@ -113,6 +113,10 @@
 
 - [This Is How Quora Shards MySQL to Handle 13+ Terabytes](https://newsletter.systemdesign.one/p/mysql-sharding)
 
+#### R companies
+
+- [How Razorpay Scaled to Handle Flash Sales at 1500 Requests per Second]([https://newsletter.systemdesign.one/p/mysql-sharding](https://newsletter.systemdesign.one/p/payment-gateway-architecture))
+
 #### S companies
 
 - [Slack Architecture](https://systemdesign.one/slack-architecture/)