diff --git a/README.md b/README.md
index 191c714..88e9145 100644
--- a/README.md
+++ b/README.md
@@ -228,10 +228,11 @@ Websites with lists of relays and their performance/health:
 - [zephyr](https://github.com/coracle-social/zephyr)![stars](https://img.shields.io/github/stars/coracle-social/zephyr.svg?style=social) - A meditative nostr feed reader
 - [Voyage](https://github.com/dluvian/voyage)![stars](https://img.shields.io/github/stars/dluvian/voyage.svg?style=social) - Lightweight Android client with a Reddit-like UI
 
-### Nostr Marketplace clients (NIP-15)
+### Nostr Marketplace clients (NIP-15 & NIP-99)
 
 - [LNBits Nostrmarket](https://github.com/lnbits/nostrmarket)![stars](https://img.shields.io/github/stars/lnbits/nostrmarket.svg?style=social) - Nostrmarket extension for LNBits allows you to sell items directly from your LNBits instance
 - [Plebeian Market](https://github.com/PlebeianTech/plebeian-market)![stars](https://img.shields.io/github/stars/PlebeianTech/plebeian-market.svg?style=social) - The Bitcoin-native self-sovereign marketplace built on top of NIP-15 includes fixed-price items and auctions
+- [Shopstr](https://github.com/shopstr-eng/shopstr)![stars](https://img.shields.io/github/stars/shopstr-eng/shopstr.svg?style=social) - The Lightning and Cashu-native self-sovereign marketplace built on top of NIP-99 includes fixed-price items
 
 ### Client reviews and/or comparisons