diff --git a/ChangeLog.txt b/ChangeLog.txt
index 853734c23806a402872adf108d92931f114c990d..db60cd4e52b4032c8b6392fa00c2345b5ad92d01 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -6,6 +6,9 @@
 
 JSONlab ChangeLog (key features marked by *):
 
+== JSONlab 0.9.1 (codename: Rodimus, update 1), FangQ <fangq (at) nmr.mgh.harvard.edu> ==
+ 2012/12/18 *handling of various empty and sparse matrices (fixes submitted by Niclas Borlin)
+
 == JSONlab 0.9.0 (codename: Rodimus), FangQ <fangq (at) nmr.mgh.harvard.edu> ==
 
  2012/06/17 *new format for an invalid leading char, unpacking hex code in savejson
diff --git a/README.txt b/README.txt
index 8aaebbdf72d20f1b8b020cf084f901fb7d3502be..89f16cb5570bf27cb761dfbfc93fd8e4045db1d4 100644
--- a/README.txt
+++ b/README.txt
@@ -5,7 +5,7 @@
 
 *Copyright (c) 2011,2012  Qianqian Fang <fangq at nmr.mgh.harvard.edu>
 *License: BSD or GNU General Public License version 3 (GPL v3), see License*.txt
-*Version: 0.9.0 (Rodimus)
+*Version: 0.9.1 (Rodimus - Update 1)
 
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