diff --git a/ChangeLog.d/dtls-client-hello-defragmentation.txt b/ChangeLog.d/dtls-client-hello-defragmentation.txt
new file mode 100644
index 0000000000..f5ff0b754c
--- /dev/null
+++ b/ChangeLog.d/dtls-client-hello-defragmentation.txt
@@ -0,0 +1,5 @@
+Bugfix
+   * Support re-assembly of fragmented DTLS 1.2 ClientHello in Mbed TLS server.
+   * Support re-assembly of fragmented TLS 1.2 ClientHello in Mbed TLS server
+     even if TLS 1.3 support is disabled. This removes the main limitation on
+     support for re-assembly of fragmented handshake messages in TLS 1.2.