XF 1.1 Help setting up robots.txt file correct syntax

[rdn]

Here's my current robots.txt file: http://www.phcorner.net/robots.txt

User-agent: Mediapartners-Google
Disallow: /attachment*
Disallow: /cdn-cgi/
Disallow: /doubleclick/
Disallow: /goto/
Disallow: /images/
Disallow: /js/
Disallow: /posts/
Disallow: /styles/
Allow: /

User-agent: *
Disallow: /account/
Disallow: /conversations/
Disallow: /cdn-cgi/
Disallow: /doubleclick/
Disallow: /find-new/
Disallow: /goto/
Disallow: /js/
Disallow: /login/
Disallow: /posts/
Disallow: /search/
Allow: /

Sitemap: http://www.phcorner.net/sitemap/

Lines highlighted with red, Is it correct?

Is "Allow: /" necessary or obsolete already?