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diff --git a/pod/perlrun.pod b/pod/perlrun.pod
index 324bd8c..d8ed107 100644
--- a/pod/perlrun.pod
+++ b/pod/perlrun.pod
@@ -127,7 +127,7 @@ as the first line in C<*.cmd> file (B<-S> due to a bug in cmd.exe's
 =item MS-DOS
 
 Create a batch file to run your program, and codify it in
-C<ALTERNATIVE_SHEBANG> (see the F<dosish.h> file in the source
+C<ALTERNATE_SHEBANG> (see the F<dosish.h> file in the source
 distribution for more information).
 
 =item Win95/NT
@@ -894,11 +894,13 @@ used.
 
 =item PERL5LIB
 
-A colon-separated list of directories in which to look for Perl library
+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.
+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.
@@ -1062,7 +1064,7 @@ and Win32 approximate equivalent:
 
 =item PERLLIB
 
-A colon-separated list of directories in which to look for Perl library
+A list of directories in which to look for Perl library
 files before looking in the standard library and the current directory.
 If PERL5LIB is defined, PERLLIB is not used.
 
@@ -1108,27 +1110,27 @@ PERL_ENCODING environment variable is consulted for an encoding name.
 
 =item PERL_HASH_SEED
 
-(Since Perl 5.8.1.)
-
-Used to randomise Perl's internal hash function.  To emulate the
-pre-5.8.1 behaviour, set to an integer (zero means exactly the same
-order as 5.8.0).  "Pre-5.8.1" means, among other things, that hash
-keys will be ordered the same between different runs of Perl.
+(Since Perl 5.8.1.)  Used to randomise Perl's internal hash function.
+To emulate the pre-5.8.1 behaviour, set to an integer (zero means
+exactly the same order as 5.8.0).  "Pre-5.8.1" means, among other
+things, that hash keys will be ordered the same between different runs
+of Perl.
 
 The default behaviour is to randomise unless the PERL_HASH_SEED is set.
-If Perl has been compiled with the -DUSE_HASH_SEED_EXPLICIT the default
+If Perl has been compiled with C<-DUSE_HASH_SEED_EXPLICIT>, the default
 behaviour is B<not> to randomise unless the PERL_HASH_SEED is set.
 
 If PERL_HASH_SEED is unset or set to a non-numeric string, Perl uses
 the pseudorandom seed supplied by the operating system and libraries.
-If unset, each different run of Perl will have different ordering of
-the outputs of keys(), values, and each().
+This means that each different run of Perl will have a different
+ordering of the results of keys(), values(), and each().
 
 See L<perlsec/"Algorithmic Complexity Attacks"> for more information.
 
 =item PERL_HASH_SEED_DEBUG
 
-Set to (anything) to display the value of the hash seed.
+(Since Perl 5.8.1.)  Set to "1" to display (to STDERR) the value of
+the hash seed at the beginning of execution.
 
 =item PERL_ROOT (specific to the VMS port)
 
@@ -1142,7 +1144,8 @@ L<perlvms> and in F<README.vms> in the Perl source distribution.
 
 In Perls 5.8.1 and later.  If set to C<unsafe> the pre-Perl-5.8.0
 signals behaviour (immediate but unsafe) is restored.  If set to
-C<safe> the safe (or deferred) signals are used.  See L<perlipc>.
+C<safe> the safe (or deferred) signals are used.
+See L<perlipc/"Deferred Signals (Safe signals)">.
 
 =item PERL_UNICODE