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diff --git a/prolog/problems/lists/dup_2/en.py b/prolog/problems/lists/dup_2/en.py
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+id = 110
+name = 'dup/2'
+slug = 'duplicate the elements of a list'
+
+description = '''\
+<p><code>dup(L1, L2)</code>: the list <code>L2</code> is obtained from <code>L1</code> by duplicating every element.</p>
+<pre>
+  ?- dup([1,2], X).
+    X = [1,1,2,2].
+  ?- dup([1,2,3], X).
+    X = [1,1,2,2,3,3].
+</pre>'''
+
+hint = {}