diff --git a/README.CVS b/README.CVS
index d74275e..48107c8 100644
--- a/README.CVS
+++ b/README.CVS
@@ -10,4 +10,13 @@ Requirements:
   automake >= 1.6
   autoconf >= 2.54
   libtool >= 1.5
+  flex >= 2.4.1
+  bison
+
+Optional:
+
+  swig (for python and ruby bindings)
+  python
+  ruby
+  xmlto (for building documentation)