diff --git a/test/src/README.md b/test/src/README.md
new file mode 100644
index 0000000..2a0c4e3
--- /dev/null
+++ b/test/src/README.md
@@ -0,0 +1,13 @@
+# Functional Entity-Component-System
+This is an ECS written in C++, using modern C++ facilities.  
+
+I scrapped this one because I wanted to go lower-level and "make things faster" by not using the STL.
+(...That may sound like very, very bad idea to you, but trust me, it's not - or that at least, it **wasn't!**)
+
+...Also look at how naively it uses an `std::unordered_map`.
+That kind of speed is just sad...
+
+I knew of the "use a bitset as a sparse data structure!" optimization, but I wanted my ECS to be *fully dynamic*, as in - to allow users to be able to load ECS components at any time, which is why I didn't go for it, because... it requires you to have a fixed, statically-written, compile-time-ready `enum` of component types, and... I love the freedom of hackability!...
+For the love of performance, please never use RTTI.
+
+Enjoy looking at the code - have a good day! ":D!~