+LY_DEFINE(make_duration,
+ "ly:make-duration", 2, 2, 0, (SCM length, SCM dotcount,
+ SCM num, SCM den),
+" \n"
+"@var{length} is the negative logarithm (base 2) of the duration:\n"
+"1 is a half note, 2 is a quarter note, 3 is an eighth\n"
+"note, etc. The number of dots after the note is given by\n"
+"@var{dotcount}.\n"
+"\n"
+"The duration factor is optionally given by @var{num} and @var{den}.\n"
+"\n"
+"A duration is a musical duration, i.e. a length of time described by a\n"
+"power of two (whole, half, quarter, etc.) and a number of augmentation\n"
+"dots. \n"
+"\n"
+"")