diff --git a/doc/README.md b/doc/README.md
new file mode 100644
index 0000000..5e4e8bc
--- /dev/null
+++ b/doc/README.md
@@ -0,0 +1,3 @@
+
+
+https://geneticfractals.org/2020/05/17/analog-4-bit-random-number-generator/