diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index e23340fb6d..b533ee9d3b 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1692,6 +1692,15 @@
     </para>
 </section>
 
+<section id='ref-classes-sdl'>
+    <title><filename>sdl.bbclass</filename></title>
+
+    <para>
+        The <filename>sdl</filename> class supports recipes that need to build
+        software that uses the Simple DirectMedia Layer (SDL) library.
+    </para>
+</section>
+
 <section id='ref-classes-distutils'>
     <title>Python Extensions - <filename>distutils.bbclass</filename></title>