--- ray/doc/notes/ReleaseNotes	2015/09/18 18:29:00	1.269
+++ ray/doc/notes/ReleaseNotes	2016/01/29 16:21:55	1.273
@@ -1956,8 +1956,8 @@ to klems_full.cal in the process.)
 
 Added "-c" option to getinfo to execute command on data segment.
 
-=====================
-Version 5.0
+================================
+Version 5.0 (Released 9/18/2015)
 
 Changed rmtxop so it writes out same type as lesser of inputs unless
 directed otherwise using -f? option.
@@ -2056,3 +2056,17 @@ Hopeful fix to deadlock issue under Mac OS X 10.10.x (
 
 Fixed early exit of rcontrib with internal error (sample behind sender)
 discovered by Rob G.
+
+=================================
+Version 5.1
+
+Fixed issue with vchars.mta and symbols.mta not being installed in
+the appropriate metafile library location, with help from Rob G.
+
+Added ability to give quoted strings to output= directive in rfluxmtx.
+
+****** COMPATIBILITY CHANGE ********
+Added ability to digest color (CIE-XYZ) input in pabopto2bsdf.
+This change alters the .sir (interpolant) format, so these files
+will need to be regenerated.  Use the new "#colorimetry: CIE-XYZ" tag
+to enable on input.