diff --git a/README b/README
index b9181324e3a..7a227e7327f 100644
--- a/README
+++ b/README
@@ -190,6 +190,9 @@ WARNINGS:
         about this, since this kind of file system setup is not really
         supported anymore by the basic set of Linux OS components.
 
+        systemd requires that the /run mount point exists. systemd also
+        requires that /var/run is a a symlink → /run.
+
         For more information on this issue consult
         http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken