diff --git a/docs/sec4.html b/docs/sec4.html
index dc2ee8e..93f0215 100644
--- a/docs/sec4.html
+++ b/docs/sec4.html
@@ -458,8 +458,8 @@ the GTK 4 API reference.</p>
 <img src="image/screenshot_lb4.png" alt="Screenshot of the box" />
 <figcaption aria-hidden="true">Screenshot of the box</figcaption>
 </figure>
-<p>The handler corresponds to <code>btn1</code> toggles its label. The
-handler corresponds to <code>btn2</code> destroys the top-level window
+<p>The handler corresponding to <code>btn1</code> toggles its label. The
+handler corresponding to <code>btn2</code> destroys the top-level window
 and the application quits.</p>
     </div>
     <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>