A list of directories in which to look for Perl library
files before looking in the standard library and the current
directory. Any architecture-specific directories under the specified
-locations are automatically included if they exist. If PERL5LIB is not
-defined, PERLLIB is used. Directories are separated (like in PATH) by
-a colon on unixish platforms and by a semicolon on Windows (the proper
-path separator being given by the command C<perl -V:path_sep>).
+locations are automatically included if they exist (this lookup
+being done at interpreter startup time.)
+
+If PERL5LIB is not defined, PERLLIB is used. Directories are separated
+(like in PATH) by a colon on unixish platforms and by a semicolon on
+Windows (the proper path separator being given by the command C<perl
+-V:path_sep>).
When running taint checks (either because the program was running setuid
-or setgid, or the B<-T> switch was used), neither variable is used.
-The program should instead say:
+or setgid, or the B<-T> or B<-t> switch was specified), neither variable
+is used. The program should instead say:
use lib "/my/directory";