semantic-stickyfunc-show-only-functions-p

semantic-stickyfunc-show-only-functions-p is a variable defined in `util-modes.el'.
Its value is

nil

Documentation:
Non-nil means don't show lines that aren't part of a tag.
If this is nil, then comments or other text between tags that is
1 line above the top of the current window will be shown.

You can customize this variable.