diff --git a/guide/english/software-engineering/unit-tests/index.md b/guide/english/software-engineering/unit-tests/index.md
index d25f064e26..0a17557d01 100644
--- a/guide/english/software-engineering/unit-tests/index.md
+++ b/guide/english/software-engineering/unit-tests/index.md
@@ -6,6 +6,7 @@ title: Unit Tests
 Unit testing is a type of testing which is found at the bottom of the software testing pyramid.
 It involves breaking the codebase down into smaller parts (or units) and testing those in isolation.
 Depending on the type of programming language (or paradigm) these can be against anything you define as a unit, although the most common practice is against functions.
+A unit is often seen as the smallest piece of your code that can be accurately tested.
 
 ### Why do it?