Add ChangeLog entry for empty app data fix
diff --git a/ChangeLog b/ChangeLog
index 98ebd2d..54d9145 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -41,6 +41,9 @@
      Systems.
    * Fail when receiving a TLS alert message with an invalid length, or invalid
      zero-length messages when using TLS 1.2. Contributed by Espressif Systems.
+   * Fix ssl_client2 example to send application data with 0-length content
+     when the request_size argument is set to 0 as stated in the documentation.
+     Fixes #1833.
 
 Changes
    * Change the shebang line in Perl scripts to look up perl in the PATH.