# HG changeset patch
# User Alys Brooks <alysbrooks@fastmail.com>
# Date 2022-02-16 09:12:09
# Node ID 10be9f4e2000fc33bbdd29efc2b7e2d7bccdb49f
# Parent  313585ce3bf614fd9522a4ac7bc98adaae49c053

Add details about architecture.

diff --git a/README.mkd b/README.mkd
--- a/README.mkd
+++ b/README.mkd
@@ -59,6 +59,12 @@
 2. Removed the ImGui folder: `rm -r ImGui.NET/`
 3. Copied `cp -r /tmp/ImGui.NET/src/ImGui.NET .`
 
+### Architecture ###
+
+This game uses an ECS structure, with significant parts of the simulation done in the `Simulation` class and some drawing in the `FNAGame` class. I use Encompass, which calls systems engines. It also adds messages, which last only one frame and are ideal for updates.
+
+I call engines that connect the ECS and non-ECS parts bridge engines. It works reasonably well, although I'm trying to add new code to the ECS rather than to the `Simulation` and `FNAGame` classes.
+
 ### File Structure ###
 
 <pre>