diff --git a/book/source/01-intro.md b/book/source/01-intro.md
index b26e7f4..f030fdc 100644
--- a/book/source/01-intro.md
+++ b/book/source/01-intro.md
@@ -10,6 +10,15 @@ This text is *not* intended as a guide for end-users of OpenPGP-related software
 
 OpenPGP is an open standard for cryptographic operations. It is a system based on well-understood cryptographic building blocks. OpenPGP supports the secure delivery of files and messages between a sender and a recipient as well as verification of the sender. OpenPGP is an outgrowth of the ["Pretty Good Privacy (PGP)"](https://en.wikipedia.org/wiki/Pretty_Good_Privacy) encryption program and has many widely used and [interoperable implementations](interop_section).
 
+With OpenPGP, you can:
+
+- [Encrypt](encryption_chapter) and [decrypt](decryption_chapter) messages
+- [Sign](signing_data) and [verify](verification_chapter) data
+- [Issue certifications and examine statements](certifications_chapter) about keys and identities, similar to the role of a Certificate Authority in validating identities.
+
+To achieve these operations, OpenPGP utilizes a set of [established cryptographic mechanisms](cyrptography_chapter). These building blocks are integrated into OpenPGP's format, which also manages and verifies identities.
+
+
 
 ## Who is the audience for this document?