diff --git a/options.xhtml b/options.xhtml
index 9507c078c..7c6cd06d4 100644
--- a/options.xhtml
+++ b/options.xhtml
@@ -53891,6 +53891,35 @@ submodule</p>
 <p><span class="emphasis"><em>Default:</em></span>
 <code class="literal">{ }</code></p>
 
+<p><span class="emphasis"><em>Declared by:</em></span></p>
+<table border="0" summary="Simple list" class="simplelist">
+<tr><td>
+<code class="filename"><a class="filename"  href="https://github.com/nix-community/home-manager/blob/master/modules/programs/zsh.nix" target="_top">
+&lt;home-manager/modules/programs/zsh.nix&gt;
+</a></code>
+</td></tr>
+</table>
+</dd>
+<dt>
+ <span class="term">
+ <a id="opt-programs.zsh.history.append"></a><a class="term" href="options.xhtml#opt-programs.zsh.history.append"><code class="option">programs.zsh.history.append</code>
+  </a>
+ </span>
+</dt>
+<dd>
+<p>If set, zsh sessions will append their history list to the history
+file, rather than replace it. Thus, multiple parallel zsh sessions
+will all have the new entries from their history lists added to the
+history file, in the order that they exit.</p><p>This file will still be periodically re-written to trim it when the
+number of lines grows 20% beyond the value specified by
+<code class="literal">programs.zsh.history.save</code>.</p>
+
+<p><span class="emphasis"><em>Type:</em></span>
+boolean</p>
+
+<p><span class="emphasis"><em>Default:</em></span>
+<code class="literal">false</code></p>
+
 <p><span class="emphasis"><em>Declared by:</em></span></p>
 <table border="0" summary="Simple list" class="simplelist">
 <tr><td>