diff --git a/man/udevadm.xml b/man/udevadm.xml
index accf70129e..46693f1dab 100644
--- a/man/udevadm.xml
+++ b/man/udevadm.xml
@@ -49,6 +49,9 @@
     <cmdsynopsis>
       <command>udevadm monitor <optional>options</optional></command>
     </cmdsynopsis>
+    <cmdsynopsis>
+      <command>udevadm hwdb <optional>options</optional></command>
+    </cmdsynopsis>
     <cmdsynopsis>
       <command>udevadm test <optional>options</optional> <replaceable>devpath</replaceable></command>
     </cmdsynopsis>
@@ -420,6 +423,22 @@
       </variablelist>
     </refsect2>
 
+    <refsect2><title>udevadm hwdb <optional>options</optional></title>
+      <para>Maintain the hardware database index in /etc/udev/hwdb.bin.</para>
+      <variablelist>
+        <varlistentry>
+          <term><option>--update</option></term>
+          <listitem>
+            <para>Compile the hardware dabase information located in /usr/lib/udev/hwdb.d/,
+            /etc/udev/hwdb.d/ and store it in /etc/udev/hwdb.bin. This should be done with
+            any update to the source files, it will not be called automatically. The running
+            udev daemon will detect a new database on its own and does not need to be
+            notified about it.</para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+    </refsect2>
+
     <refsect2><title>udevadm test <optional>options</optional> <replaceable>devpath</replaceable></title>
       <para>Simulate a udev event run for the given device, and print debug output.</para>
       <variablelist>