diff --git a/NEWS b/NEWS
index b75638ed36..58a0f032a8 100644
--- a/NEWS
+++ b/NEWS
@@ -417,6 +417,9 @@ CHANGES WITH 228:
 
           https://sourceware.org/bugzilla/show_bug.cgi?id=19108
 
+          Note that only util-linux versions built with
+          --enable-libmount-force-mountinfo are supported.
+
         * Support for the ".snapshot" unit type has been removed. This
           feature turned out to be little useful and little used, and
           has now been removed from the core and from systemctl.
diff --git a/README b/README
index 0118c102f6..ca8993cb12 100644
--- a/README
+++ b/README
@@ -118,6 +118,7 @@ REQUIREMENTS:
         glibc >= 2.16
         libcap
         libmount >= 2.27.1 (from util-linux)
+                (util-linux *must* be built with --enable-libmount-force-mountinfo)
         libseccomp >= 1.0.0 (optional)
         libblkid >= 2.24 (from util-linux) (optional)
         libkmod >= 15 (optional)