diff --git a/README.md b/README.md
index 0bced90..61c0808 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-The code in this project was tested with sbt version 1.8 or mill version 0.10.12.
+The code in this project was tested with verilator version 4.038 and sbt version 1.8 or mill version 0.10.12.
 
 # Prerequisites
 - verilator (for running the testbenches)
@@ -24,4 +24,4 @@ mill raytracer.test
 or 
 ```
 sbt test
-```
\ No newline at end of file
+```