diff --git a/documentation/sdk-manual/sdk-appendix-obtain.xml b/documentation/sdk-manual/sdk-appendix-obtain.xml
index 242dff4f76..78203a093c 100644
--- a/documentation/sdk-manual/sdk-appendix-obtain.xml
+++ b/documentation/sdk-manual/sdk-appendix-obtain.xml
@@ -159,6 +159,20 @@
                 <ulink url='&YOCTO_DOCS_REF_URL;#var-SDKMACHINE'><filename>SDKMACHINE</filename></ulink>
                 variable in the <filename>local.conf</filename> file in your
                 Build Directory is correctly set.
+                <note>
+                    If you are building an SDK installer for the Extensible
+                    SDK, the <filename>SDKMACHINE</filename> value must be
+                    set for the architecture of the machine you are using to
+                    build the installer.
+                    If <filename>SDKMACHINE</filename> is not set appropriately,
+                    the build fails and provides an error message similar to
+                    the following:
+                    <literallayout class='monospaced'>
+     The extensible SDK can currently only be built for the same architecture as the machine being built on - SDK_ARCH is
+     set to i686 (likely via setting SDKMACHINE) which is different from the architecture of the build machine (x86_64).
+     Unable to continue.
+                    </literallayout>
+                </note>
                 </para></listitem>
             <listitem><para>
                 <emphasis>Build the SDK Installer:</emphasis>