diff --git a/REFERENCE.md b/REFERENCE.md
index 39de250..c29d161 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -1,249 +1,253 @@
 # Reference
 <!-- DO NOT EDIT: This document was generated by Puppet Strings -->
 
 ## Resource types
 
 * [`zfs`](#zfs): Manage zfs. Create destroy and set properties on zfs instances.  **Autorequires:** If Puppet is managing the zpool at the root of this zfs in
 * [`zpool`](#zpool): Manage zpools. Create and delete zpools. The provider WILL NOT SYNC, only report differences.  Supports vdevs with mirrors, raidz, logs and s
 
 ## Resource types
 
 ### zfs
 
 Manage zfs. Create destroy and set properties on zfs instances.
 
 **Autorequires:** If Puppet is managing the zpool at the root of this zfs
 instance, the zfs resource will autorequire it. If Puppet is managing any
 parent zfs instances, the zfs resource will autorequire them.
 
 #### Examples
 
 ##### Using zfs.
 
 ```puppet
 zfs { 'tstpool':
   ensure => present,
 }
 ```
 
 #### Properties
 
 The following properties are available in the `zfs` type.
 
 ##### `ensure`
 
 Valid values: present, absent
 
 The basic property that the resource should be in.
 
 Default value: present
 
 ##### `aclinherit`
 
 The aclinherit property. Valid values are `discard`, `noallow`, `restricted`, `passthrough`, `passthrough-x`.
 
 ##### `aclmode`
 
 The aclmode property. Valid values are `discard`, `groupmask`, `passthrough`.
 
 ##### `acltype`
 
 The acltype propery. Valid values are 'noacl' and 'posixacl'. Only supported on Linux.
 
 ##### `atime`
 
 The atime property. Valid values are `on`, `off`.
 
 ##### `canmount`
 
 The canmount property. Valid values are `on`, `off`, `noauto`.
 
 ##### `checksum`
 
 The checksum property. Valid values are `on`, `off`, `fletcher2`, `fletcher4`, `sha256`.
 
 ##### `compression`
 
 The compression property. Valid values are `on`, `off`, `lzjb`, `gzip`, `gzip-[1-9]`, `zle`.
 
 ##### `copies`
 
 The copies property. Valid values are `1`, `2`, `3`.
 
 ##### `dedup`
 
 The dedup property. Valid values are `on`, `off`.
 
 ##### `devices`
 
 The devices property. Valid values are `on`, `off`.
 
 ##### `exec`
 
 The exec property. Valid values are `on`, `off`.
 
 ##### `logbias`
 
 The logbias property. Valid values are `latency`, `throughput`.
 
 ##### `mountpoint`
 
 The mountpoint property. Valid values are `<path>`, `legacy`, `none`.
 
 ##### `nbmand`
 
 The nbmand property. Valid values are `on`, `off`.
 
 ##### `primarycache`
 
 The primarycache property. Valid values are `all`, `none`, `metadata`.
 
 ##### `quota`
 
 The quota property. Valid values are `<size>`, `none`.
 
 ##### `readonly`
 
 The readonly property. Valid values are `on`, `off`.
 
 ##### `recordsize`
 
 The recordsize property. Valid values are powers of two between 512 and 128k.
 
 ##### `refquota`
 
 The refquota property. Valid values are `<size>`, `none`.
 
 ##### `refreservation`
 
 The refreservation property. Valid values are `<size>`, `none`.
 
 ##### `reservation`
 
 The reservation property. Valid values are `<size>`, `none`.
 
 ##### `secondarycache`
 
 The secondarycache property. Valid values are `all`, `none`, `metadata`.
 
 ##### `setuid`
 
 The setuid property. Valid values are `on`, `off`.
 
 ##### `shareiscsi`
 
 The shareiscsi property. Valid values are `on`, `off`, `type=<type>`.
 
 ##### `sharenfs`
 
 The sharenfs property. Valid values are `on`, `off`, share(1M) options
 
 ##### `sharesmb`
 
 The sharesmb property. Valid values are `on`, `off`, sharemgr(1M) options
 
 ##### `snapdir`
 
 The snapdir property. Valid values are `hidden`, `visible`.
 
+##### `sync`
+
+The sync property. Valid values are `standard`, `always`, `disabled`.
+
 ##### `version`
 
 The version property. Valid values are `1`, `2`, `3`, `4`, `current`.
 
 ##### `volsize`
 
 The volsize property. Valid values are `<size>`
 
 ##### `vscan`
 
 The vscan property. Valid values are `on`, `off`.
 
 ##### `xattr`
 
 The xattr property. Valid values are `on`, `off`.
 
 ##### `zoned`
 
 The zoned property. Valid values are `on`, `off`.
 
 #### Parameters
 
 The following parameters are available in the `zfs` type.
 
 ##### `name`
 
 namevar
 
 The full name for this filesystem (including the zpool).
 
 ### zpool
 
 Manage zpools. Create and delete zpools. The provider WILL NOT SYNC, only report differences.
 
 Supports vdevs with mirrors, raidz, logs and spares.
 
 #### Examples
 
 ##### Using zpool.
 
 ```puppet
 zpool { 'tstpool':
   ensure => present,
   disk => '/ztstpool/dsk',
 }
 ```
 
 #### Properties
 
 The following properties are available in the `zpool` type.
 
 ##### `ensure`
 
 Valid values: present, absent
 
 The basic property that the resource should be in.
 
 Default value: present
 
 ##### `disk`
 
 The disk(s) for this pool. Can be an array or a space separated string.
 Use disk/device names as displayed by "zpool status". On Linux/ZOL, use 
 full device pathes as displayed by "zpool status -P". 
 
 ##### `mirror`
 
 List of all the devices to mirror for this pool. Each mirror should be a
 space separated string:
 
     mirror => [\"disk1 disk2\", \"disk3 disk4\"],
 
 ##### `raidz`
 
 List of all the devices to raid for this pool. Should be an array of
 space separated strings:
 
     raidz => [\"disk1 disk2\", \"disk3 disk4\"],
 
 ##### `spare`
 
 Spare disk(s) for this pool.
 
 ##### `log`
 
 Log disks for this pool. This type does not currently support mirroring of log disks.
 
 #### Parameters
 
 The following parameters are available in the `zpool` type.
 
 ##### `pool`
 
 namevar
 
 The name for this pool.
 
 ##### `raid_parity`
 
 Determines parity when using the `raidz` parameter.
 
diff --git a/lib/puppet/provider/zfs/zfs.rb b/lib/puppet/provider/zfs/zfs.rb
index 7a2f5df..d2f8a1f 100644
--- a/lib/puppet/provider/zfs/zfs.rb
+++ b/lib/puppet/provider/zfs/zfs.rb
@@ -1,104 +1,104 @@
 Puppet::Type.type(:zfs).provide(:zfs) do
   desc 'Provider for zfs.'
 
   commands zfs: 'zfs'
 
   def self.instances
     zfs(:list, '-H').split("\n").map do |line|
       name, _used, _avail, _refer, _mountpoint = line.split(%r{\s+})
       new(name: name, ensure: :present)
     end
   end
 
   def add_properties
     properties = []
     Puppet::Type.type(:zfs).validproperties.each do |property|
       next if property == :ensure
       if (value = @resource[property]) && value != ''
         if property == :volsize
           properties << '-V' << value.to_s
         else
           properties << '-o' << "#{property}=#{value}"
         end
       end
     end
     properties
   end
 
   def create
     zfs(*([:create] + add_properties + [@resource[:name]]))
   end
 
   def destroy
     zfs(:destroy, @resource[:name])
   end
 
   def exists?
     zfs(:list, @resource[:name])
     true
   rescue Puppet::ExecutionFailure
     false
   end
 
   # On FreeBSD zoned is called jailed
   def container_property
     case Facter.value(:operatingsystem)
     when 'FreeBSD'
       :jailed
     else
       :zoned
     end
   end
 
   PARAMETER_UNSET_OR_NOT_AVAILABLE = '-'.freeze unless defined? PARAMETER_UNSET_OR_NOT_AVAILABLE
 
   # https://docs.oracle.com/cd/E19963-01/html/821-1448/gbscy.html
   # shareiscsi (added in build 120) was removed from S11 build 136
   # aclmode was removed from S11 in build 139 but it may have been added back
   # acltype is for ZFS on Linux, and allows disabling or enabling POSIX ACLs
   # http://webcache.googleusercontent.com/search?q=cache:-p74K0DVsdwJ:developers.slashdot.org/story/11/11/09/2343258/solaris-11-released+&cd=13
   [:aclmode, :acltype, :shareiscsi, :overlay].each do |field|
     # The zfs commands use the property value '-' to indicate that the
     # property is not set. We make use of this value to indicate that the
     # property is not set since it is not available. Conversely, if these
     # properties are attempted to be unset, and resulted in an error, our
     # best bet is to catch the exception and continue.
     define_method(field) do
       begin
         zfs(:get, '-H', '-o', 'value', field, @resource[:name]).strip
       rescue
         PARAMETER_UNSET_OR_NOT_AVAILABLE
       end
     end
     define_method(field.to_s + '=') do |should|
       begin
         zfs(:set, "#{field}=#{should}", @resource[:name])
       rescue
         PARAMETER_UNSET_OR_NOT_AVAILABLE
       end
     end
   end
 
   [:aclinherit, :atime, :canmount, :checksum,
    :compression, :copies, :dedup, :devices, :exec, :logbias,
    :mountpoint, :nbmand, :primarycache, :quota, :readonly,
    :recordsize, :refquota, :refreservation, :reservation,
    :secondarycache, :setuid, :sharenfs, :sharesmb,
-   :snapdir, :version, :volsize, :vscan, :xattr].each do |field|
+   :snapdir, :sync, :version, :volsize, :vscan, :xattr].each do |field|
     define_method(field) do
       zfs(:get, '-H', '-o', 'value', field, @resource[:name]).strip
     end
 
     define_method(field.to_s + '=') do |should|
       zfs(:set, "#{field}=#{should}", @resource[:name])
     end
   end
 
   define_method(:zoned) do
     zfs(:get, '-H', '-o', 'value', container_property, @resource[:name]).strip
   end
 
   define_method('zoned=') do |should|
     zfs(:set, "#{container_property}=#{should}", @resource[:name])
   end
 end
diff --git a/lib/puppet/type/zfs.rb b/lib/puppet/type/zfs.rb
index 6abce88..b2cd48a 100644
--- a/lib/puppet/type/zfs.rb
+++ b/lib/puppet/type/zfs.rb
@@ -1,170 +1,174 @@
 # Manage zfs. Create destroy and set properties on zfs instances.
 module Puppet
   Type.newtype(:zfs) do
     desc <<-DESC
   Manage zfs. Create destroy and set properties on zfs instances.
 
   **Autorequires:** If Puppet is managing the zpool at the root of this zfs
   instance, the zfs resource will autorequire it. If Puppet is managing any
   parent zfs instances, the zfs resource will autorequire them.
 
   @example Using zfs.
     zfs { 'tstpool':
       ensure => present,
     }
   DESC
 
     ensurable
 
     newparam(:name) do
       desc 'The full name for this filesystem (including the zpool).'
     end
 
     newproperty(:aclinherit) do
       desc 'The aclinherit property. Valid values are `discard`, `noallow`, `restricted`, `passthrough`, `passthrough-x`.'
     end
 
     newproperty(:aclmode) do
       desc 'The aclmode property. Valid values are `discard`, `groupmask`, `passthrough`.'
     end
 
     newproperty(:acltype) do
       desc "The acltype propery. Valid values are 'noacl' and 'posixacl'. Only supported on Linux."
     end
 
     newproperty(:atime) do
       desc 'The atime property. Valid values are `on`, `off`.'
     end
 
     newproperty(:canmount) do
       desc 'The canmount property. Valid values are `on`, `off`, `noauto`.'
     end
 
     newproperty(:checksum) do
       desc 'The checksum property. Valid values are `on`, `off`, `fletcher2`, `fletcher4`, `sha256`.'
     end
 
     newproperty(:compression) do
       desc 'The compression property. Valid values are `on`, `off`, `lzjb`, `gzip`, `gzip-[1-9]`, `zle`.'
     end
 
     newproperty(:copies) do
       desc 'The copies property. Valid values are `1`, `2`, `3`.'
     end
 
     newproperty(:dedup) do
       desc 'The dedup property. Valid values are `on`, `off`.'
     end
 
     newproperty(:devices) do
       desc 'The devices property. Valid values are `on`, `off`.'
     end
 
     newproperty(:exec) do
       desc 'The exec property. Valid values are `on`, `off`.'
     end
 
     newproperty(:logbias) do
       desc 'The logbias property. Valid values are `latency`, `throughput`.'
     end
 
     newproperty(:mountpoint) do
       desc 'The mountpoint property. Valid values are `<path>`, `legacy`, `none`.'
     end
 
     newproperty(:nbmand) do
       desc 'The nbmand property. Valid values are `on`, `off`.'
     end
 
     newproperty(:overlay) do
       desc 'The overlay property. Valid values are `on`, `off`.'
 
       validate do |_value|
         raise Puppet::Error _('This property is only supported on Linux') unless Facter.value(:kernel) == 'Linux'
       end
     end
 
     newproperty(:primarycache) do
       desc 'The primarycache property. Valid values are `all`, `none`, `metadata`.'
     end
 
     newproperty(:quota) do
       desc 'The quota property. Valid values are `<size>`, `none`.'
     end
 
     newproperty(:readonly) do
       desc 'The readonly property. Valid values are `on`, `off`.'
     end
 
     newproperty(:recordsize) do
       desc 'The recordsize property. Valid values are powers of two between 512 and 128k.'
     end
 
     newproperty(:refquota) do
       desc 'The refquota property. Valid values are `<size>`, `none`.'
     end
 
     newproperty(:refreservation) do
       desc 'The refreservation property. Valid values are `<size>`, `none`.'
     end
 
     newproperty(:reservation) do
       desc 'The reservation property. Valid values are `<size>`, `none`.'
     end
 
     newproperty(:secondarycache) do
       desc 'The secondarycache property. Valid values are `all`, `none`, `metadata`.'
     end
 
     newproperty(:setuid) do
       desc 'The setuid property. Valid values are `on`, `off`.'
     end
 
     newproperty(:shareiscsi) do
       desc 'The shareiscsi property. Valid values are `on`, `off`, `type=<type>`.'
     end
 
     newproperty(:sharenfs) do
       desc 'The sharenfs property. Valid values are `on`, `off`, share(1M) options'
     end
 
     newproperty(:sharesmb) do
       desc 'The sharesmb property. Valid values are `on`, `off`, sharemgr(1M) options'
     end
 
     newproperty(:snapdir) do
       desc 'The snapdir property. Valid values are `hidden`, `visible`.'
     end
 
+    newproperty(:sync) do
+      desc 'The sync property. Valid values are `standard`, `always`, `disabled`.'
+    end
+
     newproperty(:version) do
       desc 'The version property. Valid values are `1`, `2`, `3`, `4`, `current`.'
     end
 
     newproperty(:volsize) do
       desc 'The volsize property. Valid values are `<size>`'
     end
 
     newproperty(:vscan) do
       desc 'The vscan property. Valid values are `on`, `off`.'
     end
 
     newproperty(:xattr) do
       desc 'The xattr property. Valid values are `on`, `off`.'
     end
 
     newproperty(:zoned) do
       desc 'The zoned property. Valid values are `on`, `off`.'
     end
 
     autorequire(:zpool) do
       # strip the zpool off the zfs name and autorequire it
       [@parameters[:name].value.split('/')[0]]
     end
 
     autorequire(:zfs) do
       # slice and dice, we want all the zfs before this one
       names = @parameters[:name].value.split('/')
       names.slice(1..-2).reduce([]) { |a, v| a << "#{a.last}/#{v}" }.map { |fs| names[0] + fs }
     end
   end
 end
diff --git a/spec/unit/type/zfs_spec.rb b/spec/unit/type/zfs_spec.rb
index a595302..4f85757 100644
--- a/spec/unit/type/zfs_spec.rb
+++ b/spec/unit/type/zfs_spec.rb
@@ -1,43 +1,43 @@
 require 'spec_helper'
 
 describe Puppet::Type.type(:zfs) do
-  properties = [:ensure, :mountpoint, :compression, :copies, :overlay, :quota, :reservation, :sharenfs, :snapdir]
+  properties = [:ensure, :mountpoint, :compression, :copies, :overlay, :quota, :reservation, :sharenfs, :snapdir, :sync]
 
   properties.each do |property|
     it "should have a #{property} property" do
       expect(described_class.attrclass(property).ancestors).to be_include(Puppet::Property)
     end
   end
 
   parameters = [:name]
 
   parameters.each do |parameter|
     it "should have a #{parameter} parameter" do
       expect(described_class.attrclass(parameter).ancestors).to be_include(Puppet::Parameter)
     end
   end
 
   it 'autorequires the containing zfs and the zpool' do
     zfs_provider = instance_double 'provider'
     allow(zfs_provider).to receive(:name).and_return(:zfs)
     allow(described_class).to receive(:defaultprovider) { zfs_provider }
 
     zpool_provider = instance_double 'provider'
     allow(zpool_provider).to receive(:name).and_return(:zpool)
     allow(Puppet::Type.type(:zpool)).to receive(:defaultprovider) { zpool_provider }
 
     foo_pool = Puppet::Type.type(:zpool).new(name: 'foo')
 
     foo_bar_zfs = described_class.new(name: 'foo/bar')
     foo_bar_baz_zfs = described_class.new(name: 'foo/bar/baz')
     foo_bar_baz_buz_zfs = described_class.new(name: 'foo/bar/baz/buz')
 
     Puppet::Resource::Catalog.new :testing do |conf|
       [foo_pool, foo_bar_zfs, foo_bar_baz_zfs, foo_bar_baz_buz_zfs].each { |resource| conf.add_resource resource }
     end
 
     req = foo_bar_baz_buz_zfs.autorequire.map { |edge| edge.source.ref }
 
     [foo_pool.ref, foo_bar_zfs.ref, foo_bar_baz_zfs.ref].each { |ref| expect(req.include?(ref)).to eq(true) }
   end
 end