diff --git a/docs/conf.py b/docs/conf.py
index fdb1fcb..07cb87b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -57,7 +57,7 @@ copyright = u'2014, sh'
 # The short X.Y version.
 version = '0.6'
 # The full version, including alpha/beta/rc tags.
-release = '0.6.6'
+release = '0.6.7'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/docs/tutorial/index.rst b/docs/tutorial/index.rst
index 22cd4a7..b3a6330 100644
--- a/docs/tutorial/index.rst
+++ b/docs/tutorial/index.rst
@@ -338,6 +338,7 @@ In this example all keys have a static prefix of len 5. ::
 
     opts = rocksdb.Options()
     opts.prefix_extractor = StaticPrefix()
+    opts.allow_concurrent_memtable_write = False
     opts.memtable_factory = rocksdb.HashSkipListMemtableFactory()
     opts.create_if_missing = True
 
@@ -349,6 +350,7 @@ In this example all keys have a static prefix of len 5. ::
 For initial bulk loads the Vector-MemtableFactory makes sense. ::
 
     opts = rocksdb.Options()
+    opts.allow_concurrent_memtable_write = False
     opts.memtable_factory = rocksdb.VectorMemtableFactory()
     opts.create_if_missing = True
 
diff --git a/setup.py b/setup.py
index 0b3f59c..4da7daa 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@ mod1 = Extension(
 
 setup(
     name="python-rocksdb",
-    version='0.6.6',
+    version='0.6.7',
     description="Python bindings for RocksDB",
     keywords='rocksdb',
     author='Ming Hsuan Tu',