diff --git a/doc/release-notes.md b/doc/release-notes.md
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -3,3 +3,5 @@
   <https://download.bitcoinabc.org/0.17.3/>
 
 This release includes the following features and fixes:
+ - Log difference between block header time and received time when competing blocks are received for the same chain height.
+ - Discourage selfish mining by favoring blocks with more accurate timestamps.