diff --git a/liststuples.html b/liststuples.html
index 9f1bc68..359f20d 100755
--- a/liststuples.html
+++ b/liststuples.html
@@ -915,7 +915,7 @@ <h2>8.1. Tuples are used for grouping data<a class="headerlink" href="#tuples-ar
 horsemen = ["war", "famine", "pestilence", "death"]
 print("pestilence" in horsemen)  # True
 print("debauchery" in horsemen)  # False
-print("debauchery" not in horsemen)   # False</textarea>
+print("debauchery" not in horsemen)   # True</textarea>
 </div>
 <script type="text/javascript">
 pythonTool.lineNumberFlags['listmembershipexample_code'] = true;