Update README.md

README.md

@@ -14,7 +14,7 @@ Program main loop
 
 - Eventually acquires the profiling data.
 - Check if it is the iteration limit and pauses in this case.
-- Wait for the keyboard or the waiting semaphores
+- Wait for the keyboard ( period == -1) or a waiting semaphores
 - Ready to start, updates the timer
 
      {