system to use (@pxref{Process Information}). Otherwise, the coding
system comes from @code{coding-system-for-read}, if that is
non-@code{nil}; or else from the defaulting mechanism (@pxref{Default
-Coding Systems}).
+Coding Systems}). If the text output by a process contains null
+bytes, Emacs by default uses @code{no-conversion} for it; see
+@ref{Lisp and Coding Systems, inhibit-null-byte-detection}, for how to
+control this behavior.
@strong{Warning:} Coding systems such as @code{undecided} which
determine the coding system from the data do not work entirely