diff --git a/doc/flatpak-builder.xml b/doc/flatpak-builder.xml
index 08dfb25c..8ae33f55 100644
--- a/doc/flatpak-builder.xml
+++ b/doc/flatpak-builder.xml
@@ -577,6 +577,16 @@
                 </para></listitem>
             </varlistentry>
 
+            <varlistentry>
+                <term><option>--override-source-date-epoch</option></term>
+
+                <listitem><para>
+                  Set this timestamp as SOURCE_DATE_EPOCH to perform the
+                  build, instead of the last modification time of the manifest.
+                  This is available since 1.3.1.
+                </para></listitem>
+            </varlistentry>
+
             <varlistentry>
                 <term><option>--add-tag=TAG</option></term>