Edited wiki page RIO through web user interface.

diff --git a/wiki/RIO.wiki b/wiki/RIO.wiki
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@@ -30,6 +30,10 @@ The species tree ideally is in [http://www.biomedcentral.com/1471-2105/10/356/ p
 The species tree is allowed to have nodes with more than two descendants (polytomies), as long as the (slower) GSDIR ([GSDI GSDI] re-rooting) algorithm is used. 
 
 
+==== Note ====
+Since the Java memory default allocation too small for even moderately large data-sets, it is necessary to increase it with the `-Xmx2048m` command line option.
+
+
 === Examples ===
 `rio gene_trees.nh species.xml outtable.tsv log.txt`