diff --git a/CHANGES b/CHANGES
index 16b24ae79..0d001d19e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,19 @@
 ===============================================================================
-                               Changes in 1.0
+                               Changes in 1.0b1
 ===============================================================================
 
-# The first release of Argobots.
+- Added new API routines for bulk ULT creation and destruction
+- Reduced the overhead of error checking
+- Fixed bugs in some thread synchronization routines
+- Fixed POWER8 support
+- CPU affinity improvements on Intel KNL
+- Improved the dynamic management of large numbers of execution streams
+- Removed the local-exec TLS option
+- Updated the documentation
+- Added performance benchmarks
+
+===============================================================================
+                               Changes in 1.0a1
+===============================================================================
+
+The first release of Argobots.
diff --git a/maint/version.m4 b/maint/version.m4
index 7dcfb61d2..467dfd28e 100644
--- a/maint/version.m4
+++ b/maint/version.m4
@@ -3,7 +3,7 @@
 # See COPYRIGHT in top-level directory.
 #
 
-m4_define([ABT_VERSION_m4],[1.0a1])dnl
+m4_define([ABT_VERSION_m4],[1.0b1])dnl
 m4_define([ABT_RELEASE_DATE_m4],[unreleased development copy])dnl
 
 # For libtool ABI versioning rules see: