1 files changed, 4 insertions, 0 deletions
diff --git a/Misc/NEWS b/Misc/NEWS
index 332c7ef..b737df8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -39,6 +39,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #21291: subprocess's Popen.wait() is now thread safe so that
+  multiple threads may be calling wait() or poll() on a Popen instance
+  at the same time without losing the Popen.returncode value.
+
 - Issue #21127: Path objects can now be instantiated from str subclass
   instances (such as numpy.str_).