diff --git a/docs/development/best-practices.md b/docs/development/best-practices.md
index 32443b35f52f48b2316c0175b28c82ffa5cc3e28..6da69b62360cc583e658cb022518d9d5f92ec55e 100644
--- a/docs/development/best-practices.md
+++ b/docs/development/best-practices.md
@@ -11,7 +11,8 @@ Follow these best practices when you're working on our code.
 - Always add unit tests for full code coverage
   - Only use `istanbul` comments for unreachable code coverage that is needed for `codecov` completion
   - Use descriptive `istanbul` comments
-- Avoid cast or prefer `x as T` instead of `<T>x` cast.
+- Avoid cast or prefer `x as T` instead of `<T>x` cast
+- Avoid `Boolean` instead use `is` functions from `@sindresorhus/is` package, for example: `is.string`
 
 ```ts
 // istanbul ignore next: can never happen