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README.md

@@ -352,7 +352,23 @@ object NginxContainer {
 
 ### Migration from the classic API
 
-TODO
+1. If you have custom containers created with the `GenericContainer`, add `ContainerDef` in the companion like this:
+   ```scala
+   object MyCustomContainer {
+     case class Def(/*constructor params here*/) extends GenericContainer.Def[MyCustomContainer](
+       new MyCustomContainer(/*constructor params here*/)
+     )
+   }
+   ```
+2. If you are using `ForEachTestContainer`:
+    1. If your test contains only one container, replace `ForEachTestContainer` with `TestContainerForEach`
+    2. If your test contains multiple containers, replace `ForEachTestContainer` with `TestContainersForEach`
+3. If you are using `ForAllTestContainer`:
+    1. If your test contains only one container, replace `ForAllTestContainer` with `TestContainerForAll`
+    2. If your test contains multiple containers, replace `ForAllTestContainer` with `TestContainersForAll`
+4. Fix all compilation errors using compiler messages and examples above.
+
+If you have any questions or difficulties feel free to ask it in our [slack channel](https://testcontainers.slack.com/messages/CAFK4GL85).
 
 ## Release notes