diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index a3830d8861..0e3b6bd3be 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -1928,7 +1928,7 @@
                 </para>
 
                 <para>
-                    You can specify three features in the form of a
+                    You can specify these features in the form of a
                     space-separated list:
                     <itemizedlist>
                         <listitem><para><emphasis>image:</emphasis>
@@ -1936,6 +1936,14 @@
                             includes the list of installed packages among other
                             things.
                             </para></listitem>
+                        <listitem><para><emphasis>task:</emphasis>
+                            Save output file signatures for
+                            <ulink url='&YOCTO_DOCS_OM_URL;#shared-state-cache'>shared state</ulink>
+                            (sstate) tasks.
+                            This saves one file per task and lists the SHA-256
+                            checksums for each file staged (i.e. the output of
+                            the task).
+                            </para></listitem>
                         <listitem><para><emphasis>package:</emphasis>
                             Analysis of the contents of individual packages.
                             </para></listitem>
@@ -1948,7 +1956,7 @@
 
                 <para>
                     By default, the <filename>buildhistory</filename> class
-                    enables all three features:
+                    enables the following features:
                     <literallayout class='monospaced'>
      BUILDHISTORY_FEATURES ?= "image package sdk"
                     </literallayout>