Issue #10859: Make `contextlib.GeneratorContextManager` officially
private by renaming it to `_GeneratorContextManager`.
diff --git a/Misc/NEWS b/Misc/NEWS
index 0683245..0b2d346 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -40,6 +40,9 @@
 Library
 -------
 
+- Issue #10859: Make ``contextlib.GeneratorContextManager`` officially
+  private by renaming it to ``_GeneratorContextManager``.
+
 - Issue #10042: Fixed the total_ordering decorator to handle cross-type
   comparisons that could lead to infinite recursion.