The Bootstrap Grid system section says:

Content should be placed within columns, and only columns may be immediate children of rows.

See http://getbootstrap.com/css/#grid

The Bootstrap docs don't always follow its own rule:

Case in point, the div.bs-docs-header has a child div.container, which directly contains content.

I think what the docs really mean is the second part of the quote: "only columns may be immediate children of rows." I would feel comfortable placing content:

1. outside a .container
2. between a .container and a .row
3. inside a .col-
4. between a .col- and a child .row

In other words:

.container
   Content
      .row
         No Content
            .col-
                Content
                    .row
                        No Content
                            .col-

Am I off base here? Let me know on Twitter @dicshaunary.