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diff --git a/pod/perlfunc.pod b/pod/perlfunc.pod
index 49eb729..7d9e237 100644
--- a/pod/perlfunc.pod
+++ b/pod/perlfunc.pod
@@ -2667,9 +2667,10 @@ X<length> X<size>
 =item length
 
 Returns the length in I<characters> of the value of EXPR.  If EXPR is
-omitted, returns length of C<$_>.  Note that this cannot be used on
-an entire array or hash to find out how many elements these have.
-For that, use C<scalar @array> and C<scalar keys %hash> respectively.
+omitted, returns length of C<$_>.  If EXPR is undefined, returns C<undef>.
+Note that this cannot be used on an entire array or hash to find out how
+many elements these have. For that, use C<scalar @array> and C<scalar keys
+%hash> respectively.
 
 Note the I<characters>: if the EXPR is in Unicode, you will get the
 number of characters, not the number of bytes.  To get the length
@@ -2749,7 +2750,8 @@ Wednesday.  C<$yday> is the day of the year, in the range C<0..364>
 C<$isdst> is true if the specified time occurs during Daylight Saving
 Time, false otherwise.
 
-If EXPR is omitted, C<localtime()> uses the current time (C<localtime(time)>).
+If EXPR is omitted, C<localtime()> uses the current time (as returned
+by the C<time()> built-in).
 
 In scalar context, C<localtime()> returns the ctime(3) value:
 
@@ -4060,12 +4062,6 @@ If the package name is null, the C<main> package as assumed.  That is,
 C<$::sail> is equivalent to C<$main::sail> (as well as to C<$main'sail>,
 still seen in older code).
 
-If NAMESPACE is omitted, then there is no current package, and all
-identifiers must be fully qualified or lexicals.  However, you are
-strongly advised not to make use of this feature. Its use can cause
-unexpected behaviour, even crashing some versions of Perl. It is
-deprecated, and will be removed from a future release.
-
 See L<perlmod/"Packages"> for more information about packages, modules,
 and classes.  See L<perlsub> for other scoping issues.
 
@@ -6873,22 +6869,16 @@ of perl older than the specified one.
 
 Specifying VERSION as a literal of the form v5.6.1 should generally be
 avoided, because it leads to misleading error messages under earlier
-versions of Perl that do not support this syntax.  The equivalent numeric
-version should be used instead.
-
-Alternatively, you can use a numeric version C<use 5.006> followed by a
-v-string version like C<use v5.10.1>, to avoid the unintuitive C<use
-5.010_001>. (older perl versions fail gracefully at the first C<use>,
-later perl versions understand the v-string syntax in the second).
+versions of Perl (that is, prior to 5.6.0) that do not support this
+syntax.  The equivalent numeric version should be used instead.
 
     use v5.6.1;		# compile time version check
     use 5.6.1;		# ditto
     use 5.006_001;	# ditto; preferred for backwards compatibility
-    use 5.006; use 5.6.1;	# ditto, for compatibility and readability
 
 This is often useful if you need to check the current Perl version before
-C<use>ing library modules that have changed in incompatible ways from
-older versions of Perl.  (We try not to do this more than we have to.)
+C<use>ing library modules that won't work with older versions of Perl.
+(We try not to do this more than we have to.)
 
 Also, if the specified perl version is greater than or equal to 5.9.5,
 C<use VERSION> will also load the C<feature> pragma and enable all