diff --git a/README b/README
index 2b33b07..dd2a309 100644
--- a/README
+++ b/README
@@ -25,6 +25,10 @@ Read the documentation in doc/ for more.
 ------------------------------------------------------------------------
 DEPENDENCIES:
 
+* Requires HSX, Niklas Broberg's Haskell parser library, available at:
+    http://www.cs.chalmers.se/~d00nibro/haskell-src-exts
+  Read the README with this package for how to install it (quite simple)
+
 * Requires GNU make or BSD make to build
 * Requires GHC > 6.2 (for Typeable.h)
 * 'plugs' requires a working readline library.