diff --git a/README.md b/README.md
index aa39db9d..23a2df17 100644
--- a/README.md
+++ b/README.md
@@ -136,6 +136,8 @@ See [docs/vagrant.md](docs/vagrant.md)
 
 * Go >= 1.16
 * LLVM/clang >= 1.12
+* Bison 
+* Lex/Flex >= 2.5.31
 
 ### Building