diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4d6099..96b3049 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,8 +5,17 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
-* Migrate to new format
-* Deprecate -timestamp->seconds, -timestamp-list->seconds, -get-end-time
+### Added
+* s-expression file format support
+
+### Removed
+* timeclock.el file format support
+
+### Deprecated
+* -timestamp->seconds
+* -timestamp-list->seconds
+* -get-end-time
+* -date-op-internal
 
 ## [0.2.1] - 2019-09-09
 ### Fixed
diff --git a/chronometrist-common.el b/chronometrist-common.el
index 945fb6e..1bda91c 100644
--- a/chronometrist-common.el
+++ b/chronometrist-common.el
@@ -149,6 +149,7 @@ SECONDS] or (HOURS MINUTES SECONDS)."
 
 (defun chronometrist-date-op-internal (seconds minutes hours day month year operator count)
   "Helper function for `chronometrist-date-op'."
+  (declare (obsolete nil "Chronometrist v0.3.0"))
   (-->
    (encode-time seconds minutes hours day month year)
    (funcall (cond ((equal operator '+) 'time-add)