diff --git a/documentation/ref-manual/ref-images.xml b/documentation/ref-manual/ref-images.xml
index 6b07dea19c..e7d76f2b1b 100644
--- a/documentation/ref-manual/ref-images.xml
+++ b/documentation/ref-manual/ref-images.xml
@@ -82,9 +82,13 @@
             An image that conforms to the Linux Standard Base (LSB) specification.
             </para></listitem>
         <listitem><para><emphasis><filename>core-image-testmaster</filename>:</emphasis>
-            An "known good" image referred to as a "master" image that you
-            can first boot into a separate partition and then interact with in
-            order to deploy the image to be tested.
+            A "master" image designed to be used for automated runtime testing.
+            Provides a "known good" image that is deployed to a separate
+            partition so that you can boot into it and use it to deploy a
+            second image to be tested.
+            You can find more information about runtime testing in the
+            "<ulink url='&YOCTO_DOCS_DEV_URL;#performing-automated-runtime-testing'>Performing Automated Runtime Testing</ulink>"
+            section in the Yocto Project Development Manual.
             </para></listitem>
         <listitem><para><emphasis><filename>core-image-lsb-dev</filename>:</emphasis>
             A <filename>core-image-lsb</filename> image that is suitable for development work