diff --git a/doc/lectures/writings.html b/doc/lectures/writings.html
index cf84fa85..f5c85bf1 100644
--- a/doc/lectures/writings.html
+++ b/doc/lectures/writings.html
@@ -3,6 +3,6 @@
 
 <ul>
  <li> August 23: Overview, theta-rule scheme for u'=-au.
-   <a href="Aug23-1.pdf">Part 1</a>, <a href="Aug23-1.pdf">Part 2</a>
+   <a href="Aug23-1.pdf">Part 1</a>, <a href="Aug23-2.pdf">Part 2</a>
 </ul>