#6750: TextIOWrapped could duplicate output when several threads write to it.
this affect text files opened with io.open(), and the print() function of py3k
diff --git a/Misc/NEWS b/Misc/NEWS
index e9a929a..3b0bd5c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
Core and Builtins
-----------------
+- Issue #6750: A text file opened with io.open() could duplicate its output
+ when writing from multiple threads at the same time.
+
- Issue #6704: Improve the col_offset in AST for "for" statements with
a target of tuple unpacking.