-this. The positional parameters are relative to the staff center line,
-positive numbers displacing upwards, counting one for each line and
-space. The @code{clefOctavation} value would normally be set to 7, -7,
-15 or -15, but other values are valid.
+this. In order to get key signatures on the correct staff lines,
+@code{middleCClefPosition} must also be set. The positional parameters
+are relative to the staff center line, positive numbers displacing
+upwards, counting one for each line and space. The
+@code{clefOctavation} value would normally be set to 7, -7, 15 or -15,
+but other values are valid.