diff --git a/book/src/caveat.md b/book/src/caveat.md
new file mode 100644
index 00000000..df8f8c4c
--- /dev/null
+++ b/book/src/caveat.md
@@ -0,0 +1,3 @@
+> ⚠️ **IN-PROGRESS VERSION OF SALSA.** ⚠️
+>
+> This page describes the unreleased "Salsa 2022" version, which is a major departure from older versions of salsa. The code here works but is only available on github and from the `salsa-entity-mock` crate.
diff --git a/book/src/overview.md b/book/src/overview.md
index 5e50dd1f..fe281bc0 100644
--- a/book/src/overview.md
+++ b/book/src/overview.md
@@ -1,5 +1,7 @@
 # Salsa overview
 
+{{#include caveat.md}}
+
 This page contains a brief overview of the pieces of a salsa program. For a more detailed look, check out the [tutorial](./tutorial.md), which walks through the creation of an entire project end-to-end.
 
 ## Database
diff --git a/book/src/tutorial.md b/book/src/tutorial.md
index b59c5471..b3439310 100644
--- a/book/src/tutorial.md
+++ b/book/src/tutorial.md
@@ -1,5 +1,7 @@
 # Tutorial: calc
 
+{{#include caveat.md}}
+
 This tutorial walks through an end-to-end example of using Salsa.
 It does not assume you know anything about salsa,
 but reading the [overview](./overview.md) first is probably a good idea to get familiar with the basic concepts.