// ## Unique, mutable references
//@ There is a second way to borrow something, a second kind of reference: The *mutable reference*. This is a reference that comes with the promise
-//@ that nobody else has *any kind of access* to the referee - there is no aliasing. It is thus always safe to perform mutation through such a reference.
+//@ that nobody else has *any kind of access* to the referee - in contrast to shared references, there is no aliasing with mutable references. It is thus always safe to perform mutation through such a reference.
//@ Because there cannot be another reference to the same data, we could also call it a *unique* reference, but that is not their official name.
//@ As an example, consider a function which increments every element of a vector by 1.