Added note stating that the parser module will need updating for most
changes to this file.
diff --git a/Grammar/Grammar b/Grammar/Grammar
index dd12b6d..df4faa7 100644
--- a/Grammar/Grammar
+++ b/Grammar/Grammar
@@ -1,5 +1,12 @@
# Grammar for Python
+# Note: Changing the grammar specified in this file will most likely
+# require corresponding changes in the parser module
+# (../Modules/parsermodule.c). If you can't make the changes to
+# that module yourself, please co-ordinate the required changes
+# with someone who can; ask around on python-dev for help. Fred
+# Drake <fdrake@acm.org> will probably be listening there.
+
# Commands for Kees Blom's railroad program
#diagram:token NAME
#diagram:token NUMBER