diff --git a/README b/README
index 8ec8a99f8..45698af8e 100644
--- a/README
+++ b/README
@@ -53,6 +53,7 @@ Important Installation Notes
 GTSAM requires the following libraries to be installed on your system:
  - BOOST version 1.40 or greater (install through Linux repositories or MacPorts)
  - Cmake version 2.6 or higher
+ - Support for XCode 4.3 command line tools on Mac requires CMake 2.8.8 or higher
 
 Tested compilers
  - GCC 4.2-4.7