diff --git a/yaml2yeast/Main.hs b/yaml2yeast/Main.hs
index 70bba04..b3450a2 100644
--- a/yaml2yeast/Main.hs
+++ b/yaml2yeast/Main.hs
@@ -128,6 +128,8 @@
 --
 --  [@-@] Unparsed text following error point.
 --
+--  [@~@] Empty Token
+--
 -- In addition, the following code is used for testing partial productions
 -- and do not appear when parsing a complete YAML stream:
 --