Each element of C<%!> has a true value only if C<$!> is set to that
value. For example, C<$!{ENOENT}> is true if and only if the current
-value of C<$!> is C<ENOENT>; that is, if the mot recent error was "No
-such file or directory". To check if a particular key is meaningful
-on your system, use C<exists $!{the_key}>; for a list of legal keys,
-use C<keys %!>. See L<Errno> for more information.
+value of C<$!> is C<ENOENT>; that is, if the most recent error was
+"No such file or directory" (or its moral equivalent: not all operating
+systems give that exact error, and certainly not all languages).
+To check if a particular key is meaningful on your system, use
+C<exists $!{the_key}>; for a list of legal keys, use C<keys %!>.
+See L<Errno> for more information, and also see above for the
+validity of C<$!>.
=item $EXTENDED_OS_ERROR