Issue #21972: Make it clear that the PEP 401 future import works,
despite the PEP being rejected.
diff --git a/Grammar/Grammar b/Grammar/Grammar
index 354fe60..6c012c0 100644
--- a/Grammar/Grammar
+++ b/Grammar/Grammar
@@ -89,7 +89,7 @@
not_test: 'not' not_test | comparison
comparison: expr (comp_op expr)*
# <> isn't actually a valid comparison operator in Python. It's here for the
-# sake of a __future__ import described in PEP 401
+# sake of a __future__ import described in PEP 401 (which really works :-)
comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not'
star_expr: '*' expr
expr: xor_expr ('|' xor_expr)*