diff --git a/src/dynamic/addworkhistoryitem.php b/src/dynamic/addworkhistoryitem.php
new file mode 100644
index 0000000..712c3f6
--- /dev/null
+++ b/src/dynamic/addworkhistoryitem.php
@@ -0,0 +1,50 @@
+<?php
+require_once(__DIR__."/../core.php");
+security::checkType(security::ADMIN, security::METHOD_NOTFOUND);
+
+if (!isset($_GET["id"])) {
+  security::notFound();
+}
+
+$id = (int)$_GET["id"];
+
+$worker = workers::get($id);
+if ($worker === false) security::notFound();
+?>
+
+<dynscript>
+document.getElementById("cancel").addEventListener("click", e => {
+  e.preventDefault();
+  dynDialog.load("dynamic/workhistory.php?id="+parseInt(document.getElementById("cancel").getAttribute("data-worker-id")));
+});
+</dynscript>
+
+<form action="doaddworkhistoryitem.php" method="POST" autocomplete="off">
+  <input type="hidden" name="id" value="<?=(int)$worker["id"]?>">
+  <h4 class="mdl-dialog__title">Añadir alta/baja</h4>
+  <div class="mdl-dialog__content">
+    <p><b>Persona:</b> <?=security::htmlsafe($worker["name"])?><br>
+    <b>Empresa:</b> <?=security::htmlsafe($worker["companyname"])?></p>
+
+    <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
+      <input class="mdl-textfield__input" type="date" name="day" id="day" autocomplete="off" data-required>
+      <label class="mdl-textfield__label" for="day">Fecha</label>
+    </div>
+    <br>
+    <div class="mdlext-selectfield mdlext-js-selectfield mdlext-selectfield--floating-label">
+      <select name="status" id="status" class="mdlext-selectfield__select" data-required>
+        <option></option>
+        <?php
+        foreach (workers::$affiliationStatusesManual as $status) {
+          echo '<option value="'.(int)$status.'">'.security::htmlsafe(workers::affiliationStatusHelper($status)).'</option>';
+        }
+        ?>
+      </select>
+      <label for="status" class="mdlext-selectfield__label">Tipo</label>
+    </div>
+  </div>
+  <div class="mdl-dialog__actions">
+    <button type="submit" class="mdl-button mdl-js-button mdl-js-ripple-effect mdl-button--accent">Añadir</button>
+    <button id="cancel" class="mdl-button mdl-js-button mdl-js-ripple-effect" data-worker-id="<?=(int)$worker["id"]?>">Cancelar</button>
+  </div>
+</form>