diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 404d657128..b8e7c9f426 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -3723,6 +3723,35 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                 </para>
             </glossdef>
         </glossentry>
+
+        <glossentry id='var-NOHDD'><glossterm>NOHDD</glossterm>
+            <glossdef>
+                <para>
+                    Causes the OpenEmbedded build system to skip building the
+                    <filename>.hddimg</filename> image.
+                    The <filename>NOHDD</filename> variable is used with the
+                    <link linkend='ref-classes-buildimg'><filename>buildimg</filename></link>
+                    class.
+                    Set the variable to "1" to prevent the
+                    <filename>.hddimg</filename> image from being built.
+                </para>
+            </glossdef>
+        </glossentry>
+
+        <glossentry id='var-NOISO'><glossterm>NOISO</glossterm>
+            <glossdef>
+                <para>
+                    Causes the OpenEmbedded build system to skip building the
+                    ISO image.
+                    The <filename>NOISO</filename> variable is used with the
+                    <link linkend='ref-classes-buildimg'><filename>buildimg</filename></link>
+                    class.
+                    Set the variable to "1" to prevent the ISO image from
+                    being built.
+                </para>
+            </glossdef>
+        </glossentry>
+
     </glossdiv>
 
     <glossdiv id='var-glossary-o'><title>O</title>
@@ -4779,6 +4808,22 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-ROOTFS'><glossterm>ROOTFS</glossterm>
+            <glossdef>
+                <para>
+                    Indicates a filesystem image to include as the root
+                    filesystem.
+                </para>
+
+                <para>
+                    The <filename>ROOTFS</filename> variable is an optional
+                    variable used with the
+                    <link linkend='ref-classes-buildimg'><filename>buildimg</filename></link>
+                    class.
+                </para>
+            </glossdef>
+        </glossentry>
+
         <glossentry id='var-ROOTFS_POSTPROCESS_COMMAND'><glossterm>ROOTFS_POSTPROCESS_COMMAND</glossterm>
             <glossdef>
                 <para>