define-grob-interfaces.scm: Mention other interface locations.

diff --git a/scm/define-grob-interfaces.scm b/scm/define-grob-interfaces.scm
index 22316b5886f760532ba7bba88ad8aa8e25c2aea3..735ccb9dcd4acdf84aa040603465e18457fbc5ae 100644 (file)
--- a/scm/define-grob-interfaces.scm
+++ b/scm/define-grob-interfaces.scm
@@ -17,6 +17,11 @@
 ;;;; along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 
 
+;; The interfaces defined here generally have no code (e.g.,
+;; dynamic-interface), or have callbacks defined entirely in
+;; scheme.  Others interfaces are defined in lily/*.cc with the
+;; ADD_INTERFACE function.
+
 ;; should include default value?