diff --git a/index.html b/index.html
index ea3e39a828fc9cdb42583ffdcce35dbc4937f94c..4caaa7deb9530538629fd9658da6e46f98b54739 100644
--- a/index.html
+++ b/index.html
@@ -78,7 +78,7 @@
         <em class="sidenote">(<a href="#jureca_jupyter">see below</a> for JURECA Jupyter task bundle)</em></li>
       <li>Slides
         <ul>
-          <li><a href="Introduction-to-Pandas--slides.pdf">PDF</a></li>
+          <li><a href="Introduction-to-Pandas--slides.pdf">PDF</a> (exported from HTML presentation; imperfect)</li>
           <li><a href="Introduction-to-Pandas--slides.ipynb">Jupyter Notebook</a></li>
           <li><a href="pandas-tutorial-slides.tar.gz">HTML presentation bundle</a></li>
         </ul>