Using Comments in Relations
It is good practice to use comments in your relations. Comments help you remember why you added the relation. They also benefit others who use your models.
Every comment line must begin with a slash and an asterisk. For example:
/* Width is equal to 2*height

d1 = 2*d2
The comment must precede the relation to which it applies. When relations are sorted, the comment moves with the relation and remains above it.