diff --git a/relnotes/next b/relnotes/next
index 41733a1c35322b166d82a8eced8255a39dbc4b2b_cmVsbm90ZXMvbmV4dA==..634cea2c247f1b111cb655c42a07783e1ec06772_cmVsbm90ZXMvbmV4dA== 100644
--- a/relnotes/next
+++ b/relnotes/next
@@ -37,6 +37,8 @@
    is also supported by "premerge" as
    `merge-tools.<tool>.premerge=keep-mergediff`.
 
+ * External hooks are now called with `HGPLAIN=1` preset.
+
 == New Experimental Features ==
 
 * `experimental.single-head-per-branch:public-changes-only` can be used