docs: update CONTRIBUTING.md

ace-of-aces · ace-of-aces · commit cb1ff0cbbbbb · 2025-09-05T16:37:56.000+02:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -19,6 +19,9 @@ Please review these guidelines before submitting any pull requests.
 
 ## 1. Package Development
 
+> ![CAUTION]
+> For package testing, both `GD` and `Imagick` drivers must be installed and enabled.
+
 ### Setup
 
 Clone your fork, then install the dev dependencies:
