diff --git a/doc/release-notes.md b/doc/release-notes.md
index a29094b51..6cdd058ac 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -4,3 +4,16 @@ release-notes at release time)
 Notable changes
 ===============
 
+Hierarchical Deterministic Key Generation for Sapling
+-----------------------------------------------------
+All Sapling addresses will use hierarchical deterministic key generation
+according to ZIP 32 (keypath m/32'/133'/k' on mainnet). Transparent and
+Sprout addresses will still use traditional key generation.
+
+Backups of HD wallets, regardless of when they have been created, can
+therefore be used to re-generate all possible Sapling private keys, even the
+ones which haven't already been generated during the time of the backup.
+Regular backups are still necessary, however, in order to ensure that
+transparent and Sprout addresses are not lost.
+
+[Pull request](https://github.com/zcash/zcash/pull/3492), [ZIP 32](https://github.com/zcash/zips/blob/master/zip-0032.mediawiki)