diff --git a/INSTALL.md b/INSTALL.md
index c05491b..6088695 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -14,7 +14,15 @@ It needs php-cli residing in /usr/bin/php. You can check it by running:
 /usr/bin/php -v
 ```
 
-Also needs the "pcntl" PHP extension and on Linux the "iproute2" package.
+Also needs the "pcntl" PHP extension, check it by running:
+```
+php -i | grep "pcntl support"
+```
+
+On Linux it needs the "iproute2" package, check it by running:
+```
+ip route show
+```
 
 **Quick and fast install**
 ```