diff --git a/book/source/decryption.md b/book/source/decryption.md
index 5e9ef76..f0991ef 100644
--- a/book/source/decryption.md
+++ b/book/source/decryption.md
@@ -181,6 +181,4 @@ Each chunk is decrypted using AEAD using the message key and an IV with appended
 
 ## SED
 
-The Symmetrically Encrypted Data packet predates the SEIPD packet and is nowadays deprecated.
-Due to the lack of integrity protection, this packet is susceptible to a whole class of attacks where the attacker modifies the ciphertext.
-Therefore, implementations MUST NOT produce this packet and are encouraged not to accept incoming SED packages from untrusted sources.
\ No newline at end of file
+Legacy mode: may be decrypted, but not produced.