diff --git a/DEVELOPER_NOTES b/DEVELOPER_NOTES
index 4b562a322ec1f0e889c663f46e3136c4fea45afe..4d9d311486097d6741ae53a88019243428390998 100644
--- a/DEVELOPER_NOTES
+++ b/DEVELOPER_NOTES
@@ -4,3 +4,5 @@ the top of the pushdown store:
 String parsers cannot process correctly text files with more than 4096 characters on a single line at least on some systems. There is a bug in unget and putback function on istream.
 
 Measuring memory allocations with library compiled by g++ is not working. The overload of operator new does not work properly.
+
+All grammars with rules not allowing epsilon on the right hand side have special boolean flag generatesEpsilon. Thanks to this flag no other special handling of generating epsilon is needed.