diff --git a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
index 2490f6e..d91f437 100644
--- a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
+++ b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
@@ -503,7 +503,7 @@
         </section>
 
         <section id='unsetting-variables'>
-            <title>Unseting variables</title>
+            <title>Unsetting variables</title>
 
             <para>
                 It is possible to completely remove a variable or a variable flag
diff --git a/poky/documentation/overview-manual/overview-manual-yp-intro.xml b/poky/documentation/overview-manual/overview-manual-yp-intro.xml
index d34b640..254f191 100644
--- a/poky/documentation/overview-manual/overview-manual-yp-intro.xml
+++ b/poky/documentation/overview-manual/overview-manual-yp-intro.xml
@@ -1157,7 +1157,7 @@
                     </para></listitem>
                 <listitem><para>
                     The build system generates the file system image and a
-                    customized Extensible SDK (eSDSK) for application
+                    customized Extensible SDK (eSDK) for application
                     development in parallel.
                     </para></listitem>
             </orderedlist>
diff --git a/poky/documentation/poky.ent b/poky/documentation/poky.ent
index f951798..d0e0e3d 100644
--- a/poky/documentation/poky.ent
+++ b/poky/documentation/poky.ent
@@ -8,7 +8,7 @@
 <!ENTITY YOCTO_DOC_VERSION_MINUS_ONE "2.5.2">
 <!ENTITY DISTRO_REL_TAG "yocto-2.6.1">
 <!ENTITY METAINTELVERSION "9.0">
-<!ENTITY REL_MONTH_YEAR "January 2019">
+<!ENTITY REL_MONTH_YEAR "February 2019">
 <!ENTITY META_INTEL_REL_TAG "&METAINTELVERSION;-&DISTRO_NAME_NO_CAP;-&YOCTO_DOC_VERSION;">
 <!ENTITY POKYVERSION "21.0.1">
 <!ENTITY POKYVERSION_COMPRESSED "2101">
diff --git a/poky/documentation/ref-manual/ref-system-requirements.xml b/poky/documentation/ref-manual/ref-system-requirements.xml
index 69d4b4e..0db84e3 100644
--- a/poky/documentation/ref-manual/ref-system-requirements.xml
+++ b/poky/documentation/ref-manual/ref-system-requirements.xml
@@ -88,36 +88,56 @@
                 </itemizedlist>
             </note>
             <itemizedlist>
-<!--            <listitem><para>Ubuntu 10.04</para></listitem>
+                <listitem><para>Ubuntu 16.04 (LTS)</para></listitem>
+                <listitem><para>Ubuntu 18.04</para></listitem>
+                <listitem><para>Fedora 28</para></listitem>
+                <listitem><para>CentOS 7.x</para></listitem>
+                <listitem><para>Debian GNU/Linux 8.x (Jessie)</para></listitem>
+                <listitem><para>Debian GNU/Linux 9.x (Stretch)</para></listitem>
+                <listitem><para>OpenSUSE 42.3</para></listitem>
+            </itemizedlist>
+        </para>
+<!--
+Checkout the poky distro you are interested in (by branch or tag).
+From the poky directory, run the script:
+
+bitbake -e | grep ^SANITY_TESTED_DISTROS | sed -e 's/.*"\(.*\)".*/\1/g' -e 's!\\n!\n!g' | sed 's/^[\t]*//;s/[ \t]*$//' | grep -v Poky
+
+This returns a list of the supported distros for the release.
+
+Here is some old list items to show the form:
+
+
+                <listitem><para>Ubuntu 10.04</para></listitem>
                 <listitem><para>Ubuntu 11.10</para></listitem>
                 <listitem><para>Ubuntu 12.04 (LTS)</para></listitem>
                 <listitem><para>Ubuntu 13.10</para></listitem>
                 <listitem><para>Ubuntu 14.04 (LTS)</para></listitem>
                 <listitem><para>Ubuntu 14.10</para></listitem>
                 <listitem><para>Ubuntu 15.04</para></listitem>
-                <listitem><para>Ubuntu 15.10</para></listitem> -->
+                <listitem><para>Ubuntu 15.10</para></listitem>
                 <listitem><para>Ubuntu 16.04 (LTS)</para></listitem>
                 <listitem><para>Ubuntu 16.10 (LTS)</para></listitem>
                 <listitem><para>Ubuntu 17.04</para></listitem>
-<!--            <listitem><para>Fedora 16 (Verne)</para></listitem>
+                <listitem><para>Fedora 16 (Verne)</para></listitem>
                 <listitem><para>Fedora 17 (Spherical)</para></listitem>
                 <listitem><para>Fedora 19 (Schrödinger's Cat)</para></listitem>
                 <listitem><para>Fedora release 20 (Heisenbug)</para></listitem>
                 <listitem><para>Fedora release 22</para></listitem>
                 <listitem><para>Fedora release 23</para></listitem>
-                <listitem><para>Fedora release 24</para></listitem> -->
+                <listitem><para>Fedora release 24</para></listitem>
                 <listitem><para>Fedora release 26</para></listitem>
-<!--            <listitem><para>CentOS release 5.6 (Final)</para></listitem>
+                <listitem><para>CentOS release 5.6 (Final)</para></listitem>
                 <listitem><para>CentOS release 5.7 (Final)</para></listitem>
                 <listitem><para>CentOS release 5.8 (Final)</para></listitem>
                 <listitem><para>CentOS release 6.3 (Final)</para></listitem>
-                <listitem><para>CentOS release 6.x</para></listitem> -->
+                <listitem><para>CentOS release 6.x</para></listitem>
                 <listitem><para>CentOS release 7.x</para></listitem>
-<!--            <listitem><para>Debian GNU/Linux 6.0 (Squeeze)</para></listitem>
-                <listitem><para>Debian GNU/Linux 7.x (Wheezy)</para></listitem> -->
+                <listitem><para>Debian GNU/Linux 6.0 (Squeeze)</para></listitem>
+                <listitem><para>Debian GNU/Linux 7.x (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 8.x (Jessie)</para></listitem>
                 <listitem><para>Debian GNU/Linux 9.x (Stretch)</para></listitem>
-<!--            <listitem><para>Debian GNU/Linux 7.1 (Wheezy)</para></listitem>
+                <listitem><para>Debian GNU/Linux 7.1 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.2 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.3 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.4 (Wheezy)</para></listitem>
@@ -128,11 +148,10 @@
                 <listitem><para>openSUSE 12.2</para></listitem>
                 <listitem><para>openSUSE 12.3</para></listitem>
                 <listitem><para>openSUSE 13.1</para></listitem>
-                <listitem><para>openSUSE 13.2</para></listitem> -->
+                <listitem><para>openSUSE 13.2</para></listitem>
                 <listitem><para>openSUSE 42.1</para></listitem>
                 <listitem><para>openSUSE 42.2</para></listitem>
-            </itemizedlist>
-        </para>
+-->
 
         <note>
             While the Yocto Project Team attempts to ensure all Yocto Project
diff --git a/poky/documentation/ref-manual/ref-variables.xml b/poky/documentation/ref-manual/ref-variables.xml
index 9e51b75..7dc9049 100644
--- a/poky/documentation/ref-manual/ref-variables.xml
+++ b/poky/documentation/ref-manual/ref-variables.xml
@@ -6697,10 +6697,10 @@
                     revisioning by appending values to the
                     <filename>INC_PR</filename> variable:
                     <literallayout class='monospaced'>
-recipes-graphics/xorg-font/xorg-font-common.inc:INC_PR = "r2"
-recipes-graphics/xorg-font/encodings_1.0.4.bb:PR = "${INC_PR}.1"
-recipes-graphics/xorg-font/font-util_1.3.0.bb:PR = "${INC_PR}.0"
-recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
+     recipes-graphics/xorg-font/xorg-font-common.inc:INC_PR = "r2"
+     recipes-graphics/xorg-font/encodings_1.0.4.bb:PR = "${INC_PR}.1"
+     recipes-graphics/xorg-font/font-util_1.3.0.bb:PR = "${INC_PR}.0"
+     recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     </literallayout>
                     The first line of the example establishes the baseline
                     revision to be used for all recipes that use the