Laitinen does not discuss some easily available tools and techniques that provide similar or better metrics. This note describes them. Laitinen does not mention that understanding is not a property of the document by itself. It is a relationship between a document and a reader. What is understandable to a programmer may be incomprehensible to users.
Different readers have different educations as well.
This note describes a way to allow for the variation in the readers. Ambiguous, incomplete, or inconsistent documents can cause problems in a project. Unless care is taken, our documentation is ambiguous, incomplete, and inconsistent. Here I will point out existing tools and techniques that help reduce these problems. These tools also improve understandability.