diff --git a/book/source/10-encryption.md b/book/source/10-encryption.md
index 84fe481..6ab287e 100644
--- a/book/source/10-encryption.md
+++ b/book/source/10-encryption.md
@@ -81,7 +81,7 @@ When communicating with a mix of recipients, some of whose OpenPGP software only
 
 ## Advanced topics
 
-### Encrypt for multiple/single subkey per certificate?
+### Encrypt to multiple/single subkey per certificate?
 
 ### "Negotiating" algorithms based on recipients preference subpackets
 
@@ -89,7 +89,7 @@ When communicating with a mix of recipients, some of whose OpenPGP software only
 
 ### Implications of how a recipient cert is "addressed" (fingerprint/key-ID vs. user-ID) (preferences, expiration, revocation)
 
-### AEAD modes: GCM
+### AEAD modes in v2 SEIPD: GCM
 
 ```{admonition} TODO
 :class: warning