man: document kernel baseline for mkosi

diff --git a/mkosi/resources/man/mkosi.1.md b/mkosi/resources/man/mkosi.1.md
index e0a6ef1b89f691ef12df4e6f202287cfdb7a1d04..10113c3c38a891ef662648167ad5dd8d06b989c7 100644 (file)
--- a/mkosi/resources/man/mkosi.1.md
+++ b/mkosi/resources/man/mkosi.1.md
@@ -2885,6 +2885,8 @@ since the last release and the packages shipped by distributions are
 very out of date. We currently recommend running **mkosi** from git until a
 new release happens.
 
+mkosi requires a Linux kernel that provides `mount_setattr()` which was introduces in 5.12.
+
 mkosi currently requires systemd 254 to build bootable disk images.
 
 When not using distribution packages make sure to install the