--- ray/doc/notes/ReleaseNotes	2014/11/12 17:42:34	1.250
+++ ray/doc/notes/ReleaseNotes	2014/11/21 00:53:52	1.251
@@ -2000,3 +2000,6 @@ Fixed bug in tensor tree BSDF code that caused bus err
 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.