diff --git a/README.md b/README.md
index 67cc61e..2f143e1 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,8 @@ instead of relying on naive regular expression parsing.
 
 **Note: This is just the VS Code extension that spawns the actual language server. The language server itself is implemented purely in PHP [in its own repository](https://github.com/felixfbecker/php-language-server), all features need to be implemented there and all issues should be reported there.**
 
+You need at least PHP 7 installed and in your PATH for the extension to work. 
+
 ## Features
 
 ### Find all symbols