diff --git a/L2_QR_factorisation.html b/L2_QR_factorisation.html
index 07dafc5..224d40e 100644
--- a/L2_QR_factorisation.html
+++ b/L2_QR_factorisation.html
@@ -589,7 +589,7 @@ <h2><span class="section-number">2.6. </span>Householder triangulation<a class="
 <li><p><span class="math notranslate nohighlight">\(x = A_{k:m,k}\)</span></p></li>
 <li><p><span class="math notranslate nohighlight">\(v_k \gets \mbox{sign}(x_1)\|x\|_2e_1 + x\)</span></p></li>
 <li><p><span class="math notranslate nohighlight">\(v_k \gets v_k/\|v_k\|\)</span></p></li>
-<li><p><span class="math notranslate nohighlight">\(A_{k:m,k:n} \gets A_{k:m,k:m} - 2v_k(v_k^*A_{k:m,k:n})\)</span>.</p></li>
+<li><p><span class="math notranslate nohighlight">\(A_{k:m,k:n} \gets A_{k:m,k:n} - 2v_k(v_k^*A_{k:m,k:n})\)</span>.</p></li>
 </ul>
 </li>
 <li><p>END FOR</p></li>
@@ -806,4 +806,4 @@ <h2><span class="section-number">2.7. </span>Application: Least squares problems
       Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 3.2.1.
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