diff --git a/ChangeLog.d/ssl-mac-zeroize.txt b/ChangeLog.d/ssl-mac-zeroize.txt
new file mode 100644
index 0000000..b49c7ac
--- /dev/null
+++ b/ChangeLog.d/ssl-mac-zeroize.txt
@@ -0,0 +1,5 @@
+Security
+   * Zeroize intermediate variables used to calculate the MAC in CBC cipher
+     suites. This hardens the library in case stack memory leaks through a
+     memory disclosure vulnerabilty, which could formerly have allowed a
+     man-in-the-middle to inject fake ciphertext into a DTLS connection.