--- a/relnotes/next	Fri Dec 20 15:50:13 2019 -0800
+++ b/relnotes/next	Tue Jan 28 14:07:57 2020 -0800
@@ -17,6 +17,9 @@
 
 == New Experimental Features ==
 
+ * Use `hg copy --forget --at-rev REV` to unmark already committed
+   copies.
+
 
 == Bug Fixes  ==