diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index fcb2215896..0945691b34 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -473,6 +473,19 @@
     </para>
 </section>
 
+<section id='ref-classes-crosssdk'>
+    <title><filename>crosssdk.bbclass</filename></title>
+
+    <para>
+        The Cross SDK <filename>crosssdk</filename> class
+        provides support for cross-compilation tools used for building
+        SDKs.
+        See the
+        "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
+        section for more discussion on these cross-compilation tools.
+    </para>
+</section>
+
 <section id='ref-classes-debian'>
     <title>Debian Renaming - <filename>debian.bbclass</filename></title>