Comments in layout RTL stylesheets are incorrect

Issue title says it all. Check out the default code together with comments for eg from starterkit/css/layout-fixed.css:

.sidebar-first #content {
  margin-left: -960px; /* The width of .region-sidebar-first. */
  margin-right: 200px; /* Negative value of #content's width + left margin. */
}

Those comments don't mesh with the values do they?

Currently this would apply to both 6.x-2 and 7.x-3 branches. I'm guessing a patch would apply to both and should thus be built against 7.x branch?