diff --git a/README.md b/README.md
index 7b6367c..fca7d89 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ let package = Package(
 It is also possible to use this library with your app in Xcode by adding it as a dependency in your Xcode project.
 
 > [!IMPORTANT]
-> Swift 5.10 or higher is required in order to build this library.
+> Swift 6.2 or higher is required in order to build this library.
 
 ## Usage
 
@@ -83,7 +83,7 @@ let service = AmiiboService(
 
 ## Testing
 
-The `AmiiboClient` protocol enables creating custom mock clients for unit testing without network calls. Conform to `AmiiboClient` and inject it into `AmiiboService` via its `init(client:)` initializer:
+The `AmiiboClient` protocol enables creating custom mock clients for unit testing without network calls. Conform to `AmiiboClient` and inject it into `AmiiboService` via its `init(client:)` initializer. Since `AmiiboClient` refines `Sendable`, conforming types must be safe to share across concurrency domains:
 
 ```swift
 import AmiiboService
@@ -104,6 +104,16 @@ struct MyMockClient: AmiiboClient {
 let service = AmiiboService(client: MyMockClient())
 ```
 
+### Running the test suite
+
+The unit tests based on a mock client run offline by default. The tests against the live service are skipped unless the `AMIIBO_LIVE_TESTS` environment variable is set to `1`, either in the environment when testing from the command line:
+
+```shell
+AMIIBO_LIVE_TESTS=1 swift test
+```
+
+or in the `Test` action of the scheme when testing from Xcode.
+
 ## Documentation
 
 Please refer to the [online documentation](https://rock-n-code.github.io/amiibo-service/documentation/amiiboservice/) for further information about this library.