Some minor changes, most of them to description

hello-world.cu

-// This is the REAL "hello world" for CUDA!
-// It takes the string "Hello ", prints it, then passes it to CUDA
-// with an array of offsets. Then the offsets are added in parallel
-// to produce the string "World!"
-// By Ingemar Ragnemalm 2010
+/* 
+##########################
+CUDA Hello World!
+Based on code by Ingemar Ragnemalm (http://computer-graphics.se/hello-world-for-cuda.html), modified by Andreas Herten
 
-// nvcc hello-world.cu -L /usr/local/cuda/lib -lcudart -o hello-world
+The string Hello is printed, then transferred to the GPU and every character shifted to form string World in parallel. The string is then transferred back and printed.
+
+Compile with nvcc, e.g. with the accompanying Makefile.
+##########################
+*/
 
 #include <iostream>
 
@@ -51,6 +54,6 @@ int main()
 	CUDA_CALL(cudaFree( bd );)
 	
 	printf("%s\n", a);
-//	sleep(1);
+
 	return EXIT_SUCCESS;
 }