<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r74704649">src/mlpack/methods/neighbor_search/knn_main.cpp</a>:</p>
<pre style='color:#555'>&gt;  PARAM_INT_IN(&quot;leaf_size&quot;, &quot;Leaf size for tree building (used for kd-trees, vp &quot;
&gt; -    &quot;trees, R trees, R* trees, X trees, Hilbert R trees, R+ trees and R++ &quot;
&gt; -    &quot;trees).&quot;, &quot;l&quot;, 20);
&gt; +    &quot;trees, R trees, R* trees, X trees, Hilbert R trees, R+ trees, R++ trees &quot;
&gt; +    &quot;and spill trees).&quot;, &quot;l&quot;, 20);
&gt; +PARAM_DOUBLE_IN(&quot;tau&quot;, &quot;Overlapping size (for spill trees).&quot;, &quot;u&quot;, 0);
&gt; +PARAM_DOUBLE_IN(&quot;rho&quot;, &quot;Balance threshold (for spill trees).&quot;, &quot;b&quot;, 0.7);
</pre>
<p>To emphasize where these are valid, I might consider writing <code>only valid for spill trees</code> instead of just <code>for spill trees</code>.</p>

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