--- ray/doc/notes/ReleaseNotes	2014/10/03 21:57:06	1.249
+++ ray/doc/notes/ReleaseNotes	2014/11/21 00:53:52	1.251
@@ -1989,3 +1989,17 @@ BSDF input file gets back the original behavior, where
 assumes that the up direction is 90-degrees from the X-axis.
 The default value of 0 corresponds to PAB's definition of
 the X-axis as being "up".
+
+Fixed bug in rsensor related to having many rows (altitude) and
+few columns (azimuth) in sensitivity file.
+
+Fixed floating point round-off error in new Hessian calculation
+for some sytems (Windows, primarily).
+
+Fixed bug in tensor tree BSDF code that caused bus error on
+some systems, and may have been source of other errors as well.
+
+(Above changes included in 4.2.2 patch release.)
+
+Improved ambient extrapolation to avoid zero values.  Actual
+threshold set to 5% of recorded value.