Completes a subsection on Bufs/Blobs refs #1513

doc/Language/nativecall.pod6

@@ -614,9 +614,23 @@ leaks.
 
 =head2 Buffers and blobs
 
-=comment TODO
-
-L<Blob>s and L<Buf>s are Perl 6 way of storing binary data. We can use them for interchange of data with native functions and data structures, although not directly. We will have to use L<C<nativecast>|/routine/nativecast>.
+L<Blob>s and L<Buf>s are the Perl 6 way of storing binary data. We can use them
+for interchange of data with native functions and data structures, although not
+directly. We will have to use L<C<nativecast>|/routine/nativecast>.
+
+=for code :preamble<use NativeCall;>
+my $blob = Blob.new(0x22, 0x33);
+my $src = nativecast(Pointer, $blob);
+
+This C<$src> can then be used as an argument for any native function that takes
+a Pointer. The opposite, putting values pointed to by a C<Pointer> into a C<Buf>
+or using it to inialize a C<Blob> is not directly supported. You might want to
+use L<C<NativeHelpers::Blob>|https://github.com/salortiz/NativeHelpers-Blob> to
+do this kind of operations.
+
+=for code :skip-test<incomplete code>
+my $esponja = blob-from-pointer( $inter, :2elems, :type(Blob[int8]));
+say $esponja;
 
 =head1 Function arguments