--- ray/doc/notes/ReleaseNotes	2007/12/13 07:03:37	1.142
+++ ray/doc/notes/ReleaseNotes	2009/05/21 18:08:43	1.157
@@ -1621,7 +1621,7 @@ Additional error-checking for source surfaces.
 Re-fixed bug in octree code that caused it to allocate 8 times as
 much memory as it actually used(!) -- this was pointed out way back
 in 1999 by Erik Reinhard and Erik Jansen, but the fix they gave me
-got lost in the slightly borken release process at the time.  This
+got lost in the slightly broken release process at the time.  This
 should make a big difference in memory usage, especially for the
 new mesh primitive.  (I measured 30% less memory usage.)
 
@@ -1644,5 +1644,54 @@ The only caveat is that -n setting > 1 requires -PP ra
 
 Added -c option to rtcontrib to facilitate cumulative calculations.
 
-Added ability to incorporate LBNL Window 6 bidirectional scattering
-distribution function (BSDF) data in mkillum.
+****** COMPATIBILITY CHANGE ********
+Fixed long-standing bug in source.cal, which caused it to produce
+reversed anisotropic photometric distributions due to the
+misorientation of the y-axis.  Thanks to Zack Rogers for discovering
+and helping debug this problem.
+
+Fixed long-standing bug in replmarks, where triangles with X-side
+aligned with Z-axis would cause incorrect rotations.  Thanks to
+Zack Rogers for finding this error.
+
+Added rsensor program to compute sensor signal for daylighting controls.
+Funding for this component was provided by the Architectural Energy
+Corporation in Boulder, CO, and directed by Zack Rogers.
+
+Added "planisphere" (stereographic) fisheye view type for traditional
+daylighting analysis.  Feature requested & explained by Axel Jacobs.
+
+Modified -c option to rtcontrib so it can take a number of input
+rays to average over, rather than only produce a single accumulated
+record (which can now be done with -c 0).
+
+=====================
+Version 4.0
+
+Added -n option to rvu to provide parallel rendering.
+
+****** COMPATIBILITY CHANGE ********
+Changed ".pic" extension to ".hdr" in all sources and documentation
+to improve interoperability with other software, since this has become
+the de facto extension for Radiance RGBE and XYZE pictures.  Since file
+extensions were never more than a convention in Radiance, this does not
+affect operation, but may require the update of scripts, etc. written
+by others that assume the ".pic" suffix for Radiance output.
+
+Added -N option to objview to support multiprocessing.
+
+Improved sampling of circular sources (source, sphere, ring types) with
+quite a bit of help from David Geisler-Moroder.
+
+Added "rpict" and "rvu" variables to rad, and made these as well as
+the "oconv", "mkillum" and "pfilt" variables accept an alternate
+command path in each case.  Change suggested by Lars Grobe based
+on similar Radzilla (radz) facility by Carsten Bauer.
+
+Fixed rad -v N specification to use actual view name if one.
+
+Fixed error in mkillum calculation where it neglected indirect
+source contributions from BTDF illum's.
+
+Added GMT and LATLONG header lines for Greenwich Mean Time and
+degrees North Latitude / East Longitude.