diff --git a/OpenPGP-Security.md b/OpenPGP-Security.md
index 8bbf890..3c66efa 100644
--- a/OpenPGP-Security.md
+++ b/OpenPGP-Security.md
@@ -190,6 +190,9 @@ see https://github.com/open-keychain/open-keychain/blob/development/OpenKeychain
 * https://tools.ietf.org/html/draft-bray-pgp-message-00
 * https://tools.ietf.org/html/draft-josefsson-openpgp-mailnews-header-07
 
+### Whiteout
+* https://github.com/whiteout-io/mail-html5/wiki/Secure-OpenPGP-Key-Pair-Synchronization-via-IMAP
+
 ### Other
 * http://datatracker.ietf.org/doc/search/?name=openpgp&rfcs=on&activedrafts=on&olddrafts=on&sort=
 * https://github.com/keygraph/project