diff --git a/man/ostree-summary.xml b/man/ostree-summary.xml
index 387dacd7..8305b4e1 100644
--- a/man/ostree-summary.xml
+++ b/man/ostree-summary.xml
@@ -51,7 +51,7 @@ Boston, MA 02111-1307, USA.
 
     <refsynopsisdiv>
             <cmdsynopsis>
-                <command>ostree summary</command> <arg choice="opt">--gpg-sign=KEYID</arg> <arg choice="opt">--gpg-homedir=HOMEDIR</arg> <arg choice="req">--update</arg> <arg choice="opt" rep="repeat">--add-metadata=<replaceable>KEY</replaceable>=<replaceable>VALUE</replaceable></arg>
+                <command>ostree summary</command> <arg choice="opt">--gpg-sign=KEYID</arg> <arg choice="opt">--gpg-homedir=HOMEDIR</arg> <arg choice="opt">--sign=KEYID</arg> <arg choice="opt">--sign-type=ENGINE</arg> <arg choice="req">--update</arg> <arg choice="opt" rep="repeat">--add-metadata=<replaceable>KEY</replaceable>=<replaceable>VALUE</replaceable></arg>
             </cmdsynopsis>
 
             <cmdsynopsis>
@@ -139,6 +139,39 @@ Boston, MA 02111-1307, USA.
                 </para></listitem>
             </varlistentry>
 
+            <varlistentry>
+                <term><option>--sign-type</option>=ENGINE</term>
+                <listitem><para>
+                    Use particular signature engine. Currently
+                    available <arg choice="plain">ed25519</arg> and <arg choice="plain">dummy</arg>
+                    signature types.
+
+                    The default is <arg choice="plain">ed25519</arg>.
+                </para></listitem>
+
+            </varlistentry>
+            <varlistentry>
+                <term><option>--sign</option>="KEY-ID"</term>
+                <listitem><para>
+                        There <literal>KEY-ID</literal> is:
+                        <variablelist>
+                            <varlistentry>
+                                <term><option>for ed25519:</option></term>
+                                <listitem><para>
+                                        <literal>base64</literal>-encoded secret key for commit signing.
+                                </para></listitem>
+                            </varlistentry>
+
+                            <varlistentry>
+                                <term><option>for dummy:</option></term>
+                                <listitem><para>
+                                            ASCII-string used as secret key.
+                                </para></listitem>
+                            </varlistentry>
+                        </variablelist>
+                </para></listitem>
+            </varlistentry>
+
         </variablelist>
     </refsect1>