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diff --git a/pod/perlvar.pod b/pod/perlvar.pod
index da06055..eae87c7 100644
--- a/pod/perlvar.pod
+++ b/pod/perlvar.pod
@@ -118,7 +118,9 @@ test.  Outside a C<while> test, this will not happen.
 Special package variables when using sort(), see L<perlfunc/sort>.
 Because of this specialness $a and $b don't need to be declared
 (using local(), use vars, or our()) even when using the strict
-vars pragma.
+vars pragma.  Don't lexicalize them with C<my $a> or C<my $b>
+if you want to be able to use them in the sort() comparison block
+or function.
 
 =back
 
@@ -609,10 +611,10 @@ Also see L<Error Indicators>.
 
 =item $@
 
-The Perl syntax error message from the last eval() operator.  If null, the
-last eval() parsed and executed correctly (although the operations you
-invoked may have failed in the normal fashion).  (Mnemonic: Where was
-the syntax error "at"?)
+The Perl syntax error message from the last eval() operator.
+If $@ is the null string, the last eval() parsed and executed
+correctly (although the operations you invoked may have failed in the
+normal fashion).  (Mnemonic: Where was the syntax error "at"?)
 
 Warning messages are not collected in this variable.  You can,
 however, set up a routine to process warnings by setting C<$SIG{__WARN__}>