diff --git a/documentation/ref-manual/ref-images.xml b/documentation/ref-manual/ref-images.xml
index cc70f89433..2930ab90ab 100644
--- a/documentation/ref-manual/ref-images.xml
+++ b/documentation/ref-manual/ref-images.xml
@@ -117,6 +117,10 @@
             "<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-testmaster-initramfs</filename>:</emphasis>
+            A RAM-based Initial Root Filesystem (initramfs) image tailored for
+            use with the <filename>core-image-testmaster</filename> image.
+            </para></listitem>
         <listitem><para><emphasis><filename>core-image-clutter</filename>:</emphasis>
             An image with support for the Open GL-based toolkit Clutter, which enables development of
             rich and animated graphical user interfaces.</para></listitem>