diff --git a/reference/gearman/constants.xml b/reference/gearman/constants.xml
index 6c602aa1c0..8965e5e0d6 100644
--- a/reference/gearman/constants.xml
+++ b/reference/gearman/constants.xml
@@ -330,6 +330,17 @@
  </para>
  <para>
   <variablelist>
+   <varlistentry xml:id="constant.gearman-client-generate-unique">
+    <term>
+     <constant>GEARMAN_CLIENT_GENERATE_UNIQUE</constant>
+     (<type>integer</type>)
+    </term>
+    <listitem>
+     <simpara>
+      Generate a unique id (UUID) for each task.
+     </simpara>
+    </listitem>
+   </varlistentry>
    <varlistentry xml:id="constant.gearman-client-non-blocking">
     <term>
      <constant>GEARMAN_CLIENT_NON_BLOCKING</constant>