diff --git a/doc/src/history.adoc b/doc/src/history.adoc
index 812e368cf0..8735a5ae8a 100644
--- a/doc/src/history.adoc
+++ b/doc/src/history.adoc
@@ -3,6 +3,12 @@
 
 == Version 5.2.1
 
+This patch reverts the change to define `_HAS_EXCEPTIONS=0` for Dinkumware
+std library. It has the undesired effect of changing the ABI. It's better for
+user code to handle the conbination of turning off exceptions while treating
+warnings as errors, and getting warnings/errors from the std library by having
+the users silence the warning themselves.
+
 == Version 5.2.0
 
 Many fixes in this release from regular contributors Nikita and Dmitry. There