diff --git a/README.md b/README.md
index f489bb95a..e6f94377c 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# MatchingEngine
+# Declarative String Processing for Swift
 
 An early experimental general-purpose pattern matching engine for Swift.
 
@@ -6,3 +6,6 @@ See [Declarative String Processing Overview][decl-string]
 
 [decl-string]: Documentation/DeclarativeStringProcessing.md
 
+## Requirements
+
+- [Swift Trunk Development Snapshot](https://www.swift.org/download/#snapshots) DEVELOPMENT-SNAPSHOT-2022-02-03 or later.