diff --git a/book/source/02-highlevel.md b/book/source/02-highlevel.md
index 36bf31b..7b14735 100644
--- a/book/source/02-highlevel.md
+++ b/book/source/02-highlevel.md
@@ -126,6 +126,9 @@ With OpenPGP it's possible to:
 
 To perform these high-level operations, a set of [established cryptographic mechanisms](cyrptography_chapter) are used as building blocks, and combined into OpenPGP's format, which additionally deals with identities and their verification.
 
+```{admonition} TODO
+Ch1 needs a "how to read this document" section and each of the Zoom-in sections needs its "you've landed here so let's explain this to you" line of some kind
+```
 ## Zooming in: Internal structure of OpenPGP data
 
 OpenPGP data is internally structured as "packets." We'll look into examples of this internal structure throughout the following chapters.