diff --git a/winsup/cygwin/release/3.1.0 b/winsup/cygwin/release/3.1.0
index 681ea5db9..82f9c53b3 100644
--- a/winsup/cygwin/release/3.1.0
+++ b/winsup/cygwin/release/3.1.0
@@ -111,3 +111,6 @@ Bug Fixes
 
 - Fix return value of ilogbl for 0 input.
   Addresses: https://cygwin.com/ml/cygwin/2019-12/msg00074.html
+
+- Let strtold set errno to ERANGE on underflow per POSIX.
+  Addresses: https://cygwin.com/ml/cygwin/2019-12/msg00072.html