From 3adc9c31f3fd46af7e3a42a5adba7471452f06e1 Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <jorge@japaric.io>
Date: Sun, 21 Apr 2019 20:25:59 +0200
Subject: update the book

---
 book/en/src/preface.md | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'book/en/src/preface.md')

diff --git a/book/en/src/preface.md b/book/en/src/preface.md
index d8f64fd..e6a52b7 100644
--- a/book/en/src/preface.md
+++ b/book/en/src/preface.md
@@ -11,6 +11,9 @@ There is a translation of this book in [Russian].
 
 [Russian]: ../ru/index.html
 
+**HEADS UP** This is an **alpha** pre-release; there may be breaking changes in
+the API and semantics before a proper release is made.
+
 {{#include ../../../README.md:5:46}}
 
 {{#include ../../../README.md:52:}}
-- 
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