diff --git a/R/MotifList-class.R b/R/MotifList-class.R
index c6b4e2d..0605ed0 100644
--- a/R/MotifList-class.R
+++ b/R/MotifList-class.R
@@ -223,7 +223,7 @@ setMethod('show', 'MotifList',
       cat ('| Created from downloaded public sources: 2013-Aug-30', '\n', sep='')
 
       tbl.dataSource = as.data.frame (table (mcols (object)$dataSource))
-      tbl.org = as.data.frame (table (mcols (object)$organism))
+      tbl.org = as.data.frame (table (mcols (object)$organism, useNA="ifany"))
       tbl.org = head (tbl.org [order (tbl.org$Freq, decreasing=TRUE),])
       totalMatrixCount = length (object)
       totalOrganismCount = length (unique (mcols (object)$organism))