Update Readme.md

exercises/sycl/12-basic-profiling/Readme.md

@@ -2,7 +2,12 @@
 
 Start from the [skeleton](naive.cpp).  Look for the lines `//TODO`
 
-In this exercise you need to implement a basic measurement of the execution time for a kernel performing matrix-matrix multiplication.  Compute the executiomn time of the kernel by taking the difference between the end of the execution of the kernel and the start of the execution.
+In this exercise you need to implement a basic measurement of the execution time for a kernel performing matrix-matrix multiplication.  
+First modify the **queue** definition and enable profiling
+```cpp
+queue q{property::queue::enable_profiling{}};
+```
+Next set-up `sycl::event` object. the same way is done in the [previous exercise](/exercises/sycl/03-axpy/). Compute the execution time of the kernel by taking the difference between the end of the execution of the kernel and the start of the execution.
 ```
 e.get_profiling_info<info::event_profiling::command_end>() - e.get_profiling_info<info::event_profiling::command_start>();
 ```