grob::offset-function: fix outdated documentation string

diff --git a/scm/output-lib.scm b/scm/output-lib.scm
index f525a1ebad7893eae39a8747854057b4ca4ffd2a..c56fbc46d4f0a0790b4e42e828f6457ddf734854 100644 (file)
--- a/scm/output-lib.scm
+++ b/scm/output-lib.scm
@@ -992,9 +992,9 @@ based on the grob property data @var{data} (which can be plain data, a
 callback itself, or an unpure-pure-container).
 
 Function @var{func} accepts a grob and returns a value that is added
-to the value resulting from @var{data}.  Optional arguments @var{plus}
-and @var{valid?} default to @code{+} and @code{number?} respectively
-and allow for using a different underlying accumulation/type.
+to the value resulting from @var{data}.  Optional argument @var{plus}
+defaults to @code{+} but may be changed to allow for using a different
+underlying accumulation.
 
 If @var{data} is @code{#f} or @code{'()}, it is not included in the sum."
   (cond ((or (not data) (null? data))