diff --git a/readme.md b/readme.md
index b012a69..437b5cb 100644
--- a/readme.md
+++ b/readme.md
@@ -76,4 +76,6 @@ The circuit generates the following signals:
 
 ![](./docs/reset-signal.png)
 
-
+````math
+3.3V 22k / \(22k + 10k\) = 2.2V
+```