diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 66e4a05509..a1d2c78449 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -211,7 +211,7 @@
     </para>
 </section>
 
-<section id='ref-classes-bin-package.bbclass'>
+<section id='ref-classes-bin-package'>
     <title><filename>bin_package.bbclass</filename></title>
 
     <para>
@@ -234,7 +234,7 @@
     </para>
 </section>
 
-<section id='ref-classes-blacklist.bbclass'>
+<section id='ref-classes-blacklist'>
     <title><filename>blacklist.bbclass</filename></title>
 
     <para>
@@ -256,7 +256,26 @@
     </para>
 </section>
 
-<section id='ref-classes-bootimg.bbclass'>
+<section id='ref-classes-boot-directdisk'>
+    <title><filename>boot-directdisk.bbclass</filename></title>
+
+    <para>
+        The boot direct disk (<filename>boot-directdisk</filename>) class
+        creates an image that can be placed directly onto a hard disk using
+        <filename>dd</filename> and then booted.
+        The image uses SYSLINUX.
+    </para>
+
+    <para>
+        The end result is a 512 boot sector populated with a
+        Master Boot Record (MBR) and partition table followed by an MSDOS
+        FAT16 partition containing SYSLINUX and a Linux kernel completed by
+        the <filename>ext2</filename> and <filename>ext3</filename>
+        root filesystems.
+    </para>
+</section>
+
+<section id='ref-classes-bootimg'>
     <title><filename>bootimg.bbclass</filename></title>
 
     <para>
diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index b8e7c9f426..f28c62454b 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -2622,7 +2622,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                 <para>
                     The <filename>INITRD</filename> variable is an optional
                     variable used with the
-                    <link linkend='ref-classes-buildimg'><filename>buildimg</filename></link>
+                    <link linkend='ref-classes-bootimg'><filename>buildimg</filename></link>
                     class.
                 </para>
             </glossdef>
@@ -3730,7 +3730,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     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>
+                    <link linkend='ref-classes-bootimg'><filename>buildimg</filename></link>
                     class.
                     Set the variable to "1" to prevent the
                     <filename>.hddimg</filename> image from being built.
@@ -3744,7 +3744,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     Causes the OpenEmbedded build system to skip building the
                     ISO image.
                     The <filename>NOISO</filename> variable is used with the
-                    <link linkend='ref-classes-buildimg'><filename>buildimg</filename></link>
+                    <link linkend='ref-classes-bootimg'><filename>buildimg</filename></link>
                     class.
                     Set the variable to "1" to prevent the ISO image from
                     being built.
@@ -4818,7 +4818,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                 <para>
                     The <filename>ROOTFS</filename> variable is an optional
                     variable used with the
-                    <link linkend='ref-classes-buildimg'><filename>buildimg</filename></link>
+                    <link linkend='ref-classes-bootimg'><filename>buildimg</filename></link>
                     class.
                 </para>
             </glossdef>