Update README.md

Author: richarddavison

README.md

@@ -5,6 +5,8 @@
 
 LLRT (**L**ow **L**atency **R**un**t**ime) is a lightweight JavaScript runtime designed to address the growing demand for fast and efficient Serverless applications. LLRT offers up to over **10x** faster startup and up to **2x** overall lower cost compared to other JavaScript runtimes running on **AWS Lambda**
 
+LLRT is built in Rust, utilizing QuickJS as JavaScript engine, ensuring efficient memory usage and swift startup.
+
 LLRT is an experimental package. It is subject to change and intended only for evaluation purposes.
 
 <sub>LLRT - [DynamoDB Put, ARM, 128MB](example/functions/src/v3-lib.mjs):<sub>