diff --git a/README.adoc b/README.adoc
index 844884f..8073c0b 100644
--- a/README.adoc
+++ b/README.adoc
@@ -2455,6 +2455,8 @@ Enable:
 /sbin/ifup -a
 ....
 
+That command goes over all (`-a) the interfaces in `/etc/network/interfaces` and brings them up.
+
 Disable:
 
 ....