diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c16353f8..704350f15 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,9 @@
       - New property for profile table: `excludable` that can be used to configure which classes are excludable at query time.
       - New optional property for profile table: `classes` that allows you to specify which classes you expect to be used.
         We recommend this for better error messages around classes, otherwise the possible class names are infered automatically.
+    - Traffic:
+      - If traffic data files contain an empty 4th column, they will update edge durations but not modify the edge weight.  This is useful for
+        updating ETAs returned, without changing route selection (for example, in a distance-based profile with traffic data loaded).
     - Infrastructure:
       - New file `.osrm.cell_metrics` created by `osrm-customize`.