Update Readme.md

Author: jdemouth

posts/american-options/Readme.md

@@ -4,6 +4,6 @@ To do this run the following command from the code-samples directory:
 
 %> git submodule update --init --recursive
 
-You can either build with Visual Studio (we provide solutions for VS2010 and VS2012) on Windows or make.
+You can either build with Visual Studio (we provide solutions for VS2010 and VS2012) on Windows or make on Linux.
 
 You need CUDA 5.5 to build with Visual Studio.