diff --git a/README.md b/README.md
index fa5b3e49..335cb554 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,7 @@ To report bugs use [engelsystem/issues](https://github.com/engelsystem/engelsyst
 ### Additional requirements if you want to build the project by yourself
  * Node >= 8 (Development/Building only)
  * Yarn (Development/Building only)
+ * PHP Composer (Development/Building only)
 
 ### Download