diff --git a/ChangeLog b/ChangeLog
index 4aaaa1a741..ee9b14ac71 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Mar  9 23:41:11 2013  Zachary Scott  <zachary@zacharyscott.net>
+
+	* thread.c: Document ThreadGroup::Default
+
 Sat Mar  9 23:31:46 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* vm_insnhelper.c (vm_call_method): block level control frame does not
diff --git a/thread.c b/thread.c
index b232f395de..899cb70c50 100644
--- a/thread.c
+++ b/thread.c
@@ -3853,6 +3853,12 @@ static const rb_data_type_t thgroup_data_type = {
  *  were created.
  */
 
+/*
+ * Document-const: Default
+ *
+ *  The default ThreadGroup created when Ruby starts; all Threads belong to it
+ *  by default.
+ */
 static VALUE
 thgroup_s_alloc(VALUE klass)
 {
diff --git a/version.h b/version.h
index 66267aa20f..9709ef0795 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.0.0"
 #define RUBY_RELEASE_DATE "2013-03-09"
-#define RUBY_PATCHLEVEL 42
+#define RUBY_PATCHLEVEL 43
 
 #define RUBY_RELEASE_YEAR 2013
 #define RUBY_RELEASE_MONTH 3