Issue #4387: binascii now refuses to accept str as binary input.
diff --git a/Misc/NEWS b/Misc/NEWS
index 723c71f..a8565c9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -24,6 +24,8 @@
 Library
 -------
 
+- Issue #4387: binascii now refuses to accept str as binary input.
+
 - Issue #4073: Add 2to3 support to build_scripts, refactor that support
   in build_py.