diff --git a/relnotes/next b/relnotes/next
index c005957365955d1a4c10ce22d6de9e100ce07619_cmVsbm90ZXMvbmV4dA==..60d0634c43c20019e7b302b0ce9802496e3f40f4_cmVsbm90ZXMvbmV4dA== 100644
--- a/relnotes/next
+++ b/relnotes/next
@@ -5,6 +5,9 @@
    source whether or not the source still exists (but the source must
    exist in the parent revision).
 
+ * New revset predicate `diffcontains(pattern)` for filtering revisions
+   in the same way as `hg grep --diff pattern`.
+
 
 == New Experimental Features ==