diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 05e0fa6ce3..e3e6675100 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -877,6 +877,54 @@
     </para>
 </section>
 
+<section id='ref-classes-image-mklibs'>
+    <title><filename>image-mklibs.bbclass</filename></title>
+
+    <para>
+        The make libraries (<filename>mklibs</filename>) class
+        enables the use of the <filename>mklibs</filename> utility during the
+        <filename>do_rootfs</filename> task, which optimizes the size of
+        libraries contained in the image.
+    </para>
+
+    <para>
+        The
+        <link linkend='var-USER_CLASSES'><filename>USER_CLASSES</filename></link>
+        variable enables this class.
+        By default, the class is enabled in the
+        <filename>local.conf.template</filename> in the
+        <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
+        as follows:
+        <literallayout class='monospaced'>
+     USER_CLASSES ?= "buildstats image-mklibs image-prelink"
+        </literallayout>
+    </para>
+</section>
+
+<section id='ref-classes-image-prelink'>
+    <title><filename>image-prelink.bbclass</filename></title>
+
+    <para>
+        The image prelink (<filename>image-prelink</filename>) class
+        enables the use of the <filename>prelink</filename> utility during
+        the <filename>do_rootfs</filename> task, which optimizes the dynamic
+        linking of shared libraries to reduce executable startup time.
+    </para>
+
+    <para>
+        The
+        <link linkend='var-USER_CLASSES'><filename>USER_CLASSES</filename></link>
+        variable enables this class.
+        By default, the class is enabled in the
+        <filename>local.conf.template</filename> in the
+        <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
+        as follows:
+        <literallayout class='monospaced'>
+     USER_CLASSES ?= "buildstats image-mklibs image-prelink"
+        </literallayout>
+    </para>
+</section>
+
 <section id='ref-classes-mime'>
     <title><filename>mime.bbclass</filename></title>