It isn't a constant pointer.  It's a pointer to constant data. <code>
const char * p = "string literals should always be treated as const data";
p++; /* perfectly valid; I can change p, it's not constant; but *p is. */
</code> How about: <code>
@brief The binary hash of the key (read-only).
</code> ?

All the same may be said repeatedly above, but repetition is boring.