diff --git a/README.md b/README.md
index 8ffa1c9..12a108b 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,9 @@ The base layer looks like this:
 
 ![Base Layer](./img/Layer-0.png)
 
+`PERMISSIVE_HOLD` is disabled on home row keys to avoid false positive on rolls,
+and enabled for thumb keys as there are few false positives in this case.
+
 The internal thumb keys move to the nav/numpad layer on hold or space/tap on
 tap. This layer is the following: