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 # Architecture
 
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+![PTB Architecture](https://gcdnb.pbrd.co/images/VYfQoTJBY1Mo.png?o=1)
+
+## Required and optional components
+
+> Explain which components are opt-in and which are opt-out.
+
+* `Updater`
+* `JobQueue`
+* `CallbackDataCache`
+* `Defaults`
+* `BasePersistence`
+* `ContextTypes`
+
+## Customizing Components
+
+> Explain which components can (or even must) be replaced by custom implementations
+
+* `BasePersistence`
+* `BaseRequest`
+* `Handler`
+* `Application` (special case in the builder pattern)
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