diff --git a/book/source/10-encryption.md b/book/source/10-encryption.md
index ca48db6..6489040 100644
--- a/book/source/10-encryption.md
+++ b/book/source/10-encryption.md
@@ -18,8 +18,6 @@ Core concept:
 
 ### SEIPD (v1)
 
-### SED
-
 ## Advanced topics
 
 ### Encrypt for multiple/single subkey per certificate?
diff --git a/book/source/11-decryption.md b/book/source/11-decryption.md
index d0e210d..930a1b7 100644
--- a/book/source/11-decryption.md
+++ b/book/source/11-decryption.md
@@ -10,6 +10,14 @@
   - using revoked subkey?
 ```
 
+## SEIPD w/ AEAD (v2)
+
+## SEIPD (v1)
+
+## SED
+
+Legacy mode, may be decrypted, but not produced.
+
 ## Advanced topics
 
 ### Selecting decryption key