diff --git a/README.md b/README.md
index 643e55e..8c31876 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,25 @@
 
 [![actions status](https://github.com/mdbrnowski/linalg-language/actions/workflows/test.yml/badge.svg)](https://github.com/mdbrnowski/linalg-language/actions)
 
+> [!IMPORTANT]
+> Python is known to be slow. This language has an interpreter *written in Python*. It will be *very* slow. Apart from providing nice syntax for matrices and tensors, it has absolutely nothing to offer; sorry about that.
+
 To see all available commands, simply run `./main.py`.
 
 I'm afraid you'll need to explore the language on your own, since I haven't had the time to write anything resembling proper documentation.
+
+Here is a sample of code:
+
+```
+a = 0;
+b = 1;
+n = 10000;
+while (a < n) {
+    print a;
+    temp = a;
+    a = b;
+    b += temp;
+}
+```
+
+For more, you can browse [tests](./tests).