diff --git a/book/source/11-armor.md b/book/source/11-armor.md
index e821169..14b2742 100644
--- a/book/source/11-armor.md
+++ b/book/source/11-armor.md
@@ -3,4 +3,5 @@
 ```
   - Why?
   - CRC and [its deprecation in crypto-refresh](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-10.html#name-optional-checksum)
+  - Linebreak normalization?
 ```
\ No newline at end of file