diff --git a/CHANGELOG.md b/CHANGELOG.md
index dae30a3..2f80f57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 ## Unreleased
 
+This is a breaking release, but the migration is easy: command line flags now
+require two dashes (`--help` instead of `-help`). The previous flag library
+already accepts this form, so if necessary you can migrate the flags first
+before upgrading.
+
+The deprecated `--statsd.listen-address` flag has been removed, use
+`--statsd.listen-udp` instead.
+
+* [CHANGE] Switch to Kingpin for flags, fixes setting log level [#141](https://github.com/prometheus/statsd_exporter/pull/141)
 * [IMPROVEMENT] Allow matching on specific metric types ([#136](https://github.com/prometheus/statsd_exporter/pulls/136))
 * [IMPROVEMENT] Summary quantiles can be configured ([#135](https://github.com/prometheus/statsd_exporter/pulls/135))
 * [BUGFIX] Fix panic if an invalid regular expression is supplied ([#126](https://github.com/prometheus/statsd_exporter/pulls/126))