diff --git a/book/source/01-intro.md b/book/source/01-intro.md
index 438d904..3fa5b10 100644
--- a/book/source/01-intro.md
+++ b/book/source/01-intro.md
@@ -32,6 +32,15 @@ This document is focused on the second group, application developers, who use Op
 :class: warning
 
 Heiko, we should elaborate a bit on why here
+
+arguments:
+
+- standardized cryptographic system
+- long history, broard support
+- lately: many high-quality, modern, library implementations (in the past there were no good ways to integrate openpgp into applications)
+- the new version of the standard is almost ready, defining a modernized version 6 of the protocol
+
+- all of this together: it's now easier than ever to add openpgp functionality to applications, and the updated standard brings the cryptographic building blocks up to the state of the art
 ```
 
 This document is not intended for end-users. It is also not for implementers of OpenPGP libraries (or other software that directly handles internal OpenPGP data structures).