diff --git a/INSTALL b/INSTALL
index ea91d4e..064e4ce 100644
--- a/INSTALL
+++ b/INSTALL
@@ -23,6 +23,7 @@ Known to work with:
   - Solaris 2.4 (sparc), gcc-3.[1-3], gcc-4.[0-2].x (*)
   - OSF/1 V4.0 (alpha), gcc-3.1
   - Irix 6.5, gcc-3.0
+  - OS X Leopard (x86), gcc 4.0.1
 
 (*) On these platforms, problems with the assembler routines have been
 reported. It may be best to add "-DNO_ASM" to CPPFLAGS before