diff --git a/artifact/README b/artifact/README
index 88e23d89bda1d153147df9b5607b56560a7c9d60..6074142866676fee22396b22738a64ef8fe03b25 100644
--- a/artifact/README
+++ b/artifact/README
@@ -30,9 +30,11 @@ Requirements for the code execution:
   
   * The code requires: a C++ compiler, MATLAB, and a bash shell. The
     code has been tested with clang++ on Mac OS and g++ on Linux and
-    with different versions of MATLAB (from R2012 to R2016a).
-    Finally, the code requires a full version of latex installed for
-    the generation of the figures (that uses tikz and pgfplots).
+    with different versions of MATLAB (from R2012 to R2016a). In
+    MATLAB, the code uses the Control Toolbox (which implements
+    functions like 'ss'). Finally, the code requires a full version
+    of latex installed for the generation of the figures (that uses
+    tikz and pgfplots).
   
 The artifact has the following folder structure: