diff --git a/README.md b/README.md
index 05e2b39..6f9fd2a 100644
--- a/README.md
+++ b/README.md
@@ -92,6 +92,8 @@ Once everything is ready visit: `http://localhost:8080`
 
 ## Run tests & static analysis
 
+Testing requires xdebug and sqlite php extensions.
+
 ```
 vendor/bin/phpunit
 vendor/bin/phpstan analyse ./backend
diff --git a/docs/development.md b/docs/development.md
index c91b7a9..d4a6448 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -30,6 +30,8 @@ Once everything is ready visit: `http://localhost:8080`
 
 ## Run tests & static analysis
 
+Testing requires xdebug and sqlite php extensions.
+
 ```
 vendor/bin/phpunit
 vendor/bin/phpstan analyse ./backend