explain why we need this grammar file (closes #13766)

diff --git a/Lib/lib2to3/Grammar.txt b/Lib/lib2to3/Grammar.txt
index 8a96726ecce142fbc91b580564669357d8d2b3eb..1e1f24cfbc7601ac57c570ad5036d977dc8af43e 100644 (file)
--- a/Lib/lib2to3/Grammar.txt
+++ b/Lib/lib2to3/Grammar.txt
@@ -1,4 +1,4 @@
-# Grammar for Python
+# Grammar for 2to3. This grammar supports Python 2.x and 3.x.
 
 # Note:  Changing the grammar specified in this file will most likely
 #        require corresponding changes in the parser module