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diff --git a/prolog/problems/trees/tolistbt_2/en.py b/prolog/problems/trees/tolistbt_2/en.py
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+++ b/prolog/problems/trees/tolistbt_2/en.py
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+id = 141
+name = 'tolistBT/2'
+slug = 'construct a list with all elements of a binary tree'
+
+description = '''\
+<p><code>tolistBT(T, L)</code>: the list <code>L</code> contains all the elements in the binary tree <code>T</code>, in infix order.</p>
+<pre>
+  ?- tolistBT(b(b(nil,2,nil),1,b(nil,3,nil)), L).
+    L = [2,1,3].
+</pre>'''
+
+hint = {}