--- a/hyphy_slac.xml	Wed Aug 21 12:27:21 2019 -0400
+++ b/hyphy_slac.xml	Thu Feb 13 15:03:50 2020 -0500
@@ -37,6 +37,10 @@
     </tests>
     <help><![CDATA[
 SLAC (Single-Likelihood Ancestor Counting) uses a combination of maximum-likelihood and counting approaches to infer nonsynonymous and synonymous substitution rates on a per-site basis for a given coding alignment and corresponding phylogeny. SLAC assumes that the selection pressure for each site is constant along the entire phylogeny.
+
+See the online documentation_ for more information.
+
+.. _documentation: http://hyphy.org/methods/selection-methods/#slac
     ]]></help>
     <expand macro="citations">
         <citation type="doi">10.1093/molbev/msi105</citation>