diff --git a/README.md b/README.md
index d1960c4057d3a75715264fc5d42b07ac2a143f90..bfe051eb7039b0348f0a45625ba70147a4623f21 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@ In this example implementation of a [ring oscillator](https://pub.pages.cba.mit.
 .wrap
 ```
 
+Where `pins` is a meta keyword, with a different meaning in the first and second operand (output VS input, respectively).
+
 ## Results
 
 | CPU Freq | Ring Freq  |