diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77af868d..4ed84608 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@ Changelog
 2.x (unreleased)
 ----------------
 
+* Switch from Optimist to Yargs for argument-parsing. Thanks Bogdan
+  Chadkin. Merge of [#672](https://github.com/mozilla/nunjucks/pull/672).
+
 * Prevent includes from writing to their including scope. Merge of
   [#667](https://github.com/mozilla/nunjucks/pull/667) (only partially
   backported to 2.x; macro var visibility not backported).