diff --git a/man/systemd-repart.xml b/man/systemd-repart.xml
index 06bccad8c32..346cc88441b 100644
--- a/man/systemd-repart.xml
+++ b/man/systemd-repart.xml
@@ -443,9 +443,13 @@
       <varlistentry>
         <term><option>--copy-from=</option><arg>IMAGE</arg></term>
 
-        <listitem><para>Instructs <command>systemd-repart</command> to copy the partitions from the given
-        image. The partitions from the given image are synthesized into partition definitions that are
-        parsed before the partition definition files.</para></listitem>
+        <listitem><para>Instructs <command>systemd-repart</command> to synthesize partition definitions from
+        the partition table in the given image. The generated definitions will copy the partitions into the
+        destination partition table. The copied partitions will have the same size, metadata and contents but
+        might have a different partition number and might be located at a different offset in the destination
+        partition table. These definitions can be combined with partition definitions read from regular
+        partition definition files. The synthesized definitions take precedence over the definitions read
+        from partition definition files.</para></listitem>
       </varlistentry>
 
       <xi:include href="standard-options.xml" xpointer="help" />