diff --git a/guide/english/developer-tools/index.md b/guide/english/developer-tools/index.md
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--- a/guide/english/developer-tools/index.md
+++ b/guide/english/developer-tools/index.md
@@ -3,7 +3,9 @@ title: Developer Tools
 ---
 ## Developer Tools
 
-In this section, we'll explain a wide variety of tools used by developers. Many of them are free or open sourced!
+Developer tools allow web developers to test and debug their code. They are different from website builders and integrated development environments in that they do not assist in the direct creation of a webpage, rather they are tools used for testing the user interface of a website or web application.
+
+In this section, we'll explain a wide variety of tools used by developers.
 
 Some examples of these tools:
 - Version control systems