(@pxref{Integer Basics}).
If @var{limit} is @code{t}, it means to choose a new seed as if Emacs
-were restarting.
+were restarting, typically from the system entropy. On systems
+lacking entropy pools, choose the seed from less-random volatile data
+such as the current time.
If @var{limit} is a string, it means to choose a new seed based on the
string's contents.