-;;; Return the position of Element (or NIL if absent) in a
-;;; null-terminated List linked by the accessor function Next. Key,
-;;; Test and Test-Not are the same as for generic sequence functions.
+;;; Return the position of ELEMENT (or NIL if absent) in a
+;;; null-terminated LIST linked by the accessor function NEXT. KEY,
+;;; TEST and TEST-NOT are the same as for generic sequence functions.