@@ 308,6 308,12 @@ This creates @file{/gnu/store} (@pxref{The Store}) and @file{/var/guix}.
The latter contains a ready-to-use profile for @code{root} (see next
step.)
+Some versions of GNU@tie{}tar raise a warning about ``implausibly old
+time stamps''. This is because all the files in the archive have their
+modification time set to zero (which means January 1st, 1970.) This is
+done on purpose to make sure the archive content is independent of its
+creation time, thus making it reproducible.
+
Do @emph{not} unpack the tarball on a working Guix system since that
would overwrite its own essential files.