diff --git a/matlab/README-gtsam-toolbox.txt b/matlab/README-gtsam-toolbox.txt
index 6f74f9806..a1691be32 100644
--- a/matlab/README-gtsam-toolbox.txt
+++ b/matlab/README-gtsam-toolbox.txt
@@ -7,8 +7,14 @@ http://borg.cc.gatech.edu/projects/gtsam
 ================================================================================
 
 This is the GTSAM MATLAB toolbox, a MATLAB wrapper around the GTSAM C++
-library.
+library. To build it, enable GTSAM_INSTALL_MATLAB_TOOLBOX in CMake.
 
+The interface to the toolbox is generated automatically by the wrap
+tool which directly parses C++ header files. The tool generates matlab
+proxy objects together with all the native functions for wrapping and
+unwrapping scalar and non scalar types and objects. The interface
+generated by the wrap tool also redirects the standard output stream
+(cout) to matlab's console.
 
 ----------------------------------------
 Note about newer Ubuntu versions unsupported by MATLAB (later than 10.04)