diff --git a/readme.pod b/readme.pod
index 7ccf7ccb7..008fb2195 100644
--- a/readme.pod
+++ b/readme.pod
@@ -91,6 +91,10 @@ headers.
 
 =item
 
+You will need the C<flex> and C<bison> packages installed.
+
+=item
+
 C<cd> to the Verilator directory containing this README.
 
 =item