diff --git a/docs.html b/docs.html
index 6170e36d..defba227 100644
--- a/docs.html
+++ b/docs.html
@@ -14221,7 +14221,7 @@ See also:
 <li><a href="#svds">svds()</a></li>
 <li><a href="#is_symmetric">.is_symmetric()</a></li>
 <!-- <li><a href="https://www.caam.rice.edu/software/ARPACK/UG/node33.html">shift-invert mode in ARPACK</a></li> -->
-<a href="https://li.mit.edu/Archive/Activities/Archive/CourseWork/Ju_Li/MITCourses/18.335/Doc/ARPACK/Lehoucq97.pdf">shift-invert mode in ARPACK</a>
+<li><a href="http://li.mit.edu/Archive/Activities/Archive/CourseWork/Ju_Li/MITCourses/18.335/Doc/ARPACK/Lehoucq97.pdf">shift-invert mode in ARPACK</a></li>
 <li><a href="https://mathworld.wolfram.com/EigenDecomposition.html">eigen decomposition in MathWorld</a></li>
 <li><a href="https://en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors">eigenvalues &amp; eigenvectors in Wikipedia</a></li>
 </ul>