From 40798d83395bac055f4f3b267603a5b02bfcfda3 Mon Sep 17 00:00:00 2001
From: Hinrich Mahler <22366557+Bibo-Joshi@users.noreply.github.com>
Date: Sat, 23 Apr 2022 08:26:32 +0200
Subject: [PATCH] add some notes on the architecture page

---
 Architecture.md | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/Architecture.md b/Architecture.md
index 86b37f2..8a725bb 100644
--- a/Architecture.md
+++ b/Architecture.md
@@ -1,3 +1,23 @@
 # Architecture
 
-> Here be text
\ No newline at end of file
+![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)
\ No newline at end of file