diff --git a/Misc/NEWS b/Misc/NEWS
index 6cb27f0..bf8d1ff 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -3,6 +3,9 @@
 
 Core
 
++ An old tokenizer bug allowed floating point literals with an incomplete
+  exponent, such as 1e and 3.1e-.  Such literals now raise SyntaxError.
+
 Library
 
 Tools