diff --git a/Docs/images/3.png b/Docs/images/3.png
new file mode 100644
index 0000000..3a6eff4
Binary files /dev/null and b/Docs/images/3.png differ
diff --git a/Docs/images/all-systems.png b/Docs/images/all-systems.png
new file mode 100644
index 0000000..5b62b98
Binary files /dev/null and b/Docs/images/all-systems.png differ
diff --git a/Docs/images/interaction-flow.png b/Docs/images/interaction-flow.png
new file mode 100644
index 0000000..40f61f3
Binary files /dev/null and b/Docs/images/interaction-flow.png differ
diff --git a/ItemEcosystem.uplugin b/ItemEcosystem.uplugin
index 165d581..b2757e4 100644
--- a/ItemEcosystem.uplugin
+++ b/ItemEcosystem.uplugin
@@ -2,6 +2,7 @@
 	"FileVersion": 3,
 	"Version": 1,
 	"VersionName": "0.1.0",
+	"EngineVersion": "5.7.0",
 	"FriendlyName": "Item Interaction Ecosystem",
 	"Description": "Universal, server-authoritative, data-driven item / inventory / interaction / placement ecosystem framework for UE5.",
 	"Category": "Gameplay",
diff --git a/README.md b/README.md
index 39e8073..942ef84 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,24 @@
 Universal, server-authoritative, data-driven framework for items, inventory,
 interaction, carrying, equipment, world-slot installation, placement and item
 features. Built for co-op horror / survival / extraction / puzzle projects.
-Tested compiling against **Unreal Engine 5.7**.
+Tested compiling against **Unreal Engine 5.7** (`ue5.7` branch) and **5.8** (`ue5.8` branch).
+
+## Architecture at a glance
+
+![Item Interaction Ecosystem — system architecture](Docs/images/all-systems.png)
+
+<details>
+<summary>More diagrams (interaction flow, inventory system)</summary>
+
+**Interaction flow — client → server → replication**
+
+![Interaction flow](Docs/images/interaction-flow.png)
+
+**Inventory system — containers, slots, operations, replication**
+
+![Inventory system](Docs/images/3.png)
+
+</details>
 
 > Status: all C++ runtime + editor modules implemented and compiling (spec stages
 > 1–11). Binary content (UMG widgets, the test map, and the DataTable *assets*