diff --git a/INSTALL.md b/INSTALL.md
index 9d79fca..3d6af33 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -94,3 +94,12 @@ ln -s /opt/bgpblist/etc/init.d/bgpblacklist /etc/init.d/bgpblacklist
 ```
 
 Use your system's way to enable that, e.g. with "update-rc.d"
+
+
+**Check at the end**
+
+Run this to check if it blocks nets and IPs:
+
+```
+ip route show | grep prohibit
+```