diff --git a/README.md b/README.md
index eee2528..34240b6 100644
--- a/README.md
+++ b/README.md
@@ -8,8 +8,10 @@ turning into a book on RISC-V programming in assembly language.
 Pull requests are welcome.
 
 I will commit PDFs of useful versions into the /releases directory for those 
-that don't care to compile their own copies.
+that don't wish to build their own.
 
+You can find the rvddt simulator mentioned in the text here: https://github.com/johnwinans/rvddt
+    
 I developed this using LaTeX via texlive.  LaTeX is very portable, you should 
 be able to tinker with it on most any platform.