Minor doc change

docs/source/user_manual/reductions.md

@@ -105,8 +105,9 @@ To execute the kernel on CPUs, not only a {any}`numpy.ndarray` has to be passed
 but also one for exporting reduction results. 
 The export mechanism can be seen in the previously generated code snippet. 
 Here, the kernel obtains a pointer with the name of the reduction symbol (here: `r`).
-This pointer not only allows providing initial values for the reduction but is also used for writing back the
-reduction result. 
+This pointer is used for exporting the reduction result back from the kernel.
+Please note that the **values passed via pointer will not be overwritten** 
+but will be incorporated in the reduction computation.
 Since our reduction result is a single scalar value, it is sufficient to set up an array comprising a singular value.
 
 ```{code-cell} ipython3