diff --git a/book/source/15-migration.md b/book/source/15-migration.md
index a833207..32e9fe2 100644
--- a/book/source/15-migration.md
+++ b/book/source/15-migration.md
@@ -36,8 +36,9 @@ Note that S2K usage mode 253 (AEAD) can be applied to both version 6 and version
 
 ### v6 signatures
 
-One feature that is denied from v4 keys are v6 signatures. Only v6 signatures may issue v4 signatures.
-Of course, the holder of a v4 certificate can still verify v6 signatures issued by a contacts v6 certificate, given that their OpenPGP subsystem supports dealing with v6 certificates and v6 signature verification.
+One feature that is denied from v4 keys are v6 signatures. Only v6 keys may issue v6 signatures.
+
+Of course, holders of v4 certificates can still verify v6 signatures, if their OpenPGP software supports dealing with v6 certificates and v6 signature verification.
 
 ### Software migration