A paragraph without designation should not be added at the end of a section consisting of several paragraphs. This is sometimes referred to as a "dangling paragraph." If it affects the last paragraph only, it should be a part of the paragraph containing it; otherwise the provision including the paragraphs should be made one subsection, and the added paragraph a separate subsection. There are even times when a dangling paragraph should be a separate section.
101 Pa. Code § 15.98