diff --git a/README.md b/README.md
index 316b281..0f4aec4 100644
--- a/README.md
+++ b/README.md
@@ -9,4 +9,6 @@ This repository contains links to implementations of strategies from *Short Term
 * [Intraday Weakness](https://moshferatu.dev/moshferatu/ninjatrader/src/branch/main/strategies/intraday-weakness)
 * [2-Period RSI](https://moshferatu.dev/moshferatu/ninjatrader/src/branch/main/strategies/2-period-rsi)
 
+In addition, this book is responsible for the [Cumulative RSI indicator](https://moshferatu.dev/moshferatu/ninjatrader/src/branch/main/indicators/cumulative-rsi).
+
 ---
\ No newline at end of file