diff --git a/reference/zip/ziparchive/addfromstring.xml b/reference/zip/ziparchive/addfromstring.xml
index 651e3e3a3e..fc5830755a 100644
--- a/reference/zip/ziparchive/addfromstring.xml
+++ b/reference/zip/ziparchive/addfromstring.xml
@@ -11,6 +11,7 @@
    <type>bool</type><methodname>ZipArchive::addFromString</methodname>
    <methodparam><type>string</type><parameter>localname</parameter></methodparam>
    <methodparam><type>string</type><parameter>contents</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
   </methodsynopsis>
   <para>
    Add a file to a ZIP archive using its contents.
@@ -38,6 +39,20 @@
       </para>
      </listitem>
     </varlistentry>
+    <varlistentry>
+     <term><parameter>flags</parameter></term>
+     <listitem>
+      <para>
+       Bitmask consisting of
+       <constant>ZipArchive::FL_OVERWRITE</constant>,
+       <constant>ZipArchive::FL_ENC_GUESS</constant>,
+       <constant>ZipArchive::FL_ENC_UTF_8</constant>,
+       <constant>ZipArchive::FL_ENC_CP437</constant>.
+       The behaviour of these constants is described on the
+       <link linkend="zip.constants">ZIP constants</link> page.
+      </para>
+     </listitem>
+    </varlistentry>
    </variablelist>
   </para>
  </refsect1>
@@ -47,6 +62,31 @@
    &return.success;
   </para>
  </refsect1>
+
+ <refsect1 role="changelog">
+  &reftitle.changelog;
+  <para>
+   <informaltable>
+    <tgroup cols="2">
+     <thead>
+      <row>
+       <entry>&Version;</entry>
+       <entry>&Description;</entry>
+      </row>
+     </thead>
+     <tbody>
+      <row>
+       <entry>8.0.0 / 1.18.0</entry>
+       <entry>
+        <parameter>flags</parameter> was added.
+       </entry>
+      </row>
+     </tbody>
+    </tgroup>
+   </informaltable>
+  </para>
+ </refsect1>
+
  <refsect1 role="examples">
   &reftitle.examples;
     <example>