diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 615adb96cb..abb40a8e1b 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1393,6 +1393,15 @@
     </para>
 </section>
 
+<section id='ref-classes-populate_sdk'>
+    <title><filename>populate_sdk.bbclass</filename></title>
+
+    <para>
+        The <filename>populate_sdk</filename> class facilitates compatibility
+        with SDK-only recipes.
+    </para>
+</section>
+
 <section id='ref-classes-perl'>
     <title>Perl Modules - <filename>cpan.bbclass</filename></title>