diff --git a/pep-keysync/draft-hoeneisen-pep-keysync.mkd b/pep-keysync/draft-hoeneisen-pep-keysync.mkd
index 0c264d0e..22fc666b 100644
--- a/pep-keysync/draft-hoeneisen-pep-keysync.mkd
+++ b/pep-keysync/draft-hoeneisen-pep-keysync.mkd
@@ -91,8 +91,8 @@ potential leaks or theft.
 ## Approach
 
 Synchronizing private keys among devices of the same user in a secure
-manner.
-
+manner by using Trustwords (cf. {{I-D.birk-pep-trustwords}}) between any
+two devices to pair them before starting the exchange of the private keys.
 
 ## Main Challenge