diff --git a/alliance/src/README.macosx b/alliance/src/README.macosx
index 3b8e41de..3cdd547d 100644
--- a/alliance/src/README.macosx
+++ b/alliance/src/README.macosx
@@ -11,6 +11,9 @@
 
 This file discuss about installation of Alliance on Mac OS X machines.
 
+2006/05/04 : Alliance is not compatible with the default installed bison (with XCode).
+             Install bison (2.0) using fink.
+
 2005/05/11 : Alliance successfully built on Mac OS X.4 (Tiger)
              with both gcc-3.3 and gcc-4.0.