README: document the new "systemd-network" user we require for systemd-networkd

diff --git a/README b/README
index 0031facf4625856a7114fb33474688826198d60c..0ea50434bbda3143877f90ef95f046a5ef5b0deb 100644 (file)
--- a/README
+++ b/README
@@ -188,6 +188,11 @@ USERS AND GROUPS:
         will drop privileges (with the exception of CAP_SYS_TIME) and
         assume this uid/gid for security reasons.
 
+        The network management daemon requires the "systemd-network"
+        system user and group to exist. During execution this network
+        facing service will drop privileges (with the exception of
+        CAP_NET_*) and assumed this uid/gid for security reasons.
+
 WARNINGS:
         systemd will warn you during boot if /etc/mtab is not a
         symlink to /proc/mounts. Please ensure that /etc/mtab is a