diff --git a/INSTALL.md b/INSTALL.md
index bb2578b..00f1869 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -1,5 +1,9 @@
 # Installation
 
+**Prerequisites**
+
+This daemon needs PHP, tested with 5.6.*, 7.4.* and 8.2.*. It may work with others or may not ;)
+
 **Quick and fast install**
 ```
 git clone https://git.funil.de/sinuspl/bgpblist /opt/bgpblist