Elaborate a bit on comma versus parentheses

doc/Language/5to6-perlop.pod6

@@ -28,7 +28,17 @@ L<Operator Precedence|/language/operators#Operator_Precedence>.
 The things listed in Perl 5's C<perlop> document as unary and list operators in
 this section tend to be things that can also be thought of as functions, such
 as C<print> and C<chdir>. As such, you can find information about them in
-the L<functions|/language/5to6-perlfunc> guide. Parentheses are still used for grouping.
+the L<functions|/language/5to6-perlfunc> guide. Parentheses are still used for
+grouping.  There is one caveat: in Perl 6, it's the C<,> (comma) that creates
+lists, B<not> parentheses.  So:
+
+=begin code
+my @foo = 1,2,3,4,5;   # no parentheses needed
+.say for 1,2,3,4,5;    # also no parentheses
+
+my $scalar = (1);      # *not* a list, as there is no comma
+my $list   = (1,);     # a List in a scalar container
+=end code
 
 =head2 The Arrow Operator