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diff --git a/prolog/problems/trees/numberbt_2/sl.py b/prolog/problems/trees/numberbt_2/sl.py
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+++ b/prolog/problems/trees/numberbt_2/sl.py
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+name = 'numberBT/2'
+slug = 'preštej število vozlišč v binarnem drevesu'
+
+description = '''\
+<p><code>numberBT(T, N)</code>: <code>N</code> je število vozlišč v binarnem drevesu<code>T</code>.</p>
+<pre>
+?- numberBT(b(b(nil,2,nil),1,b(nil,3,nil)), N).
+  N = 3.
+</pre>'''
+
+hint = {}