diff --git a/REAMDE.md b/REAMDE.md
new file mode 100644
index 0000000..5487e34
--- /dev/null
+++ b/REAMDE.md
@@ -0,0 +1,15 @@
+# Portal Transformations
+
+This is a test project.
+
+Contains just a few tool scripts to see how portal camera transformations work.
+I wanted to see everything happening in editor. The setup is messy, but somewhat
+works. You can see what you are supposed to through the portal :)
+
+## Issues
+
+One thing I wasn't able to solve is that the portal texture seems to _lag behind_
+perhaps 1 frame or something. There is a delayed sway when I move left and right
+in front of the portal. You can see it clearly on the lines on the ground - they
+are supposed to be aligned.
+
diff --git a/project.godot b/project.godot
index 72f7bab..05f6e21 100644
--- a/project.godot
+++ b/project.godot
@@ -11,6 +11,7 @@ config_version=5
 [application]
 
 config/name="Test portal transformations"
+config/tags=PackedStringArray("demo", "dp")
 run/main_scene="uid://bjp6cbtfne2qj"
 config/features=PackedStringArray("4.4", "Forward Plus")
 config/icon="res://icon.svg"