diff --git a/packages/babel-plugin-transform-block-scoping/README.md b/packages/babel-plugin-transform-block-scoping/README.md
index 6cf9ed416e..7c174e506f 100644
--- a/packages/babel-plugin-transform-block-scoping/README.md
+++ b/packages/babel-plugin-transform-block-scoping/README.md
@@ -24,6 +24,11 @@ let a = 3
 var a = 3;
 ```
 
+## Constant checks
+
+This plugin also validates all `const` variables.
+Reassignment of constants is a runtime error and it will insert the necessary error code for those.
+
 ## Installation
 
 ```sh