diff --git a/docs/tutorial/tuti.html b/docs/tutorial/tuti.html
index e6ac2804323066272b7d7c74e6da60374615221f..b31cc9a7aaf9492fa4f7f8515b4ab28b776064ee 100644
--- a/docs/tutorial/tuti.html
+++ b/docs/tutorial/tuti.html
@@ -3431,7 +3431,7 @@ ConstantDistribution
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-            src="http://sflogo.sourceforge.net/sflogo.php?group_id=192227&amp;type=1" width="88" height="31" border="0"
+            src="https://sflogo.sourceforge.net/sflogo.php?group_id=192227&amp;type=1" width="88" height="31" border="0"
             alt="SourceForge.net Logo"></a>
     <a href="https://jigsaw.w3.org/css-validator/check/referer"> <img
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