diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 6ac7142fc3..67b2890171 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1081,6 +1081,24 @@
     </para>
 </section>
 
+<section id='ref-classes-metadata_scm'>
+    <title><filename>metadata_scm.bbclass</filename></title>
+
+    <para>
+        The Metadata Source Code Management (SCM) System
+        (<filename>metadata_scm</filename>) class provides functionality for
+        querying the branch and revision of an SCM repository.
+    </para>
+
+    <para>
+        The <link linkend='ref-classes-base'><filename>base</filename></link>
+        class uses this class to print the revisions of each layer before
+        starting every build.
+        The <filename>metadata_scm</filename> class is enabled by default
+        because it is inherited by the <filename>base</filename> class.
+    </para>
+</section>
+
 <section id='ref-classes-mime'>
     <title><filename>mime.bbclass</filename></title>