XY-extent: more accurate docstring

diff --git a/scm/define-grob-properties.scm b/scm/define-grob-properties.scm
index 8fae43bcd121026770270c4b411ce3e2ffc289a4..cfa2cfb4c1ef6752e84a6be785a689ddd317111d 100644 (file)
--- a/scm/define-grob-properties.scm
+++ b/scm/define-grob-properties.scm
@@ -1018,7 +1018,8 @@ texts.")
 ;;;
 ;;; x
 ;;;
-     (X-extent ,number-pair? "Hard coded extent in X@tie{}direction.")
+     (X-extent ,number-pair? "Extent (size) in the X@tie{}direction,
+measured in staff-space units, relative to object's reference point.")
      (X-offset ,number? "The horizontal amount that this object is
 moved relative to its X-parent.")
      (X-positions ,number-pair? "Pair of X staff coordinates of a spanner
@@ -1029,7 +1030,8 @@ in the form @code{(@var{left} . @var{right})}, where both @var{left} and
 ;;;
 ;;; y
 ;;;
-     (Y-extent ,number-pair? "Hard coded extent in Y@tie{}direction.")
+     (Y-extent ,number-pair? "Extent (size) in the Y@tie{}direction,
+measured in staff-space units, relative to object's reference point.")
      (Y-offset ,number? "The vertical amount that this object is moved
 relative to its Y-parent.")