--- ray/doc/notes/ReleaseNotes	2014/05/30 00:00:54	1.235
+++ ray/doc/notes/ReleaseNotes	2014/06/19 16:26:55	1.237
@@ -1936,3 +1936,13 @@ by Rob Guglielmetti.
 Added header variables for NROWS, NCOLS and NCOMP to help standardize
 matrix files.  This functionality has been incorporated into
 rcollate, gendaymtx, and dctimestep.
+
+Created rmtxop utility to operate on multi-component matrices.  This
+facilitates some daylight matrix calculations, and provides a general
+tool for manipulating matrix data.
+
+****** COMPATIBILITY CHANGE ********
+Introduced new Hessian-based error control in irradiance caching (ambient)
+calculation.  Since the format of the stored ambient values is different,
+the old files will be rejected with an error message and must be removed.
+The programs may be compiled with the -DOLDAMB option if this is a problem.