clarify the scope of the guide, mention security ratchet

1 files changed, 12 insertions, 0 deletions

diff --git a/sq-guide.md b/sq-guide.md
index d53e6db..8d22440 100644
--- a/sq-guide.md
+++ b/sq-guide.md
@@ -124,6 +124,18 @@ people. The guide does not require any background in cryptography,
 mathematics, or programming, but does require using a computer via the
 command line.
 
+However, note that this guide aims to getting the reader to a point
+where they can use cryptography at all. It does not aim to teach the
+reader how to protect against motivated, targeted attacks from
+organized crime or intelligence organizations. Such protection will
+probably build on top of cryptography, but is outside the scope of
+this guide.
+
+You can think of this guide giving you a way for the first turn of the
+_security rachet_. Every turn of the ratchet improves security a
+little bit, but achieving protection against targeted attacks will
+require a great many turns.
+
 
 ## Scope of this guide