diff --git a/gadget/4.0/README.md b/gadget/4.0/README.md
index 9c0bafcff589eb4fdfdc935fe27ae98f5b439fb8..d6273134ccb87f29c978a0a685b0cf57ec804d22 100644
--- a/gadget/4.0/README.md
+++ b/gadget/4.0/README.md
@@ -10,6 +10,8 @@ GADGET simulation code, which is a parallel cosmological N-body and SPH code mea
 
 ## Characteristics of Benchmark
 
+GADGET-4 supports collisionless simulations and smoothed particle hydrodynamics on massively parallel computers. All communication between concurrent execution processes is done either explicitly by means of the message passing interface (MPI), or implicitly through shared-memory accesses on processes on multi-core nodes. The code is mostly written in ISO C++ (assuming the C++11 standard), and should run on all parallel platforms that support at least MPI-3. So far, the compatibility of the code with current Linux/UNIX-based platforms has been confirmed on a large number of systems.
+
 
 ## Mechanics of Building Benchmark
 Complete Build instructions can be found at