diff --git a/README b/README
index f8f31fbab2..039110e880 100644
--- a/README
+++ b/README
@@ -80,6 +80,7 @@ REQUIREMENTS:
           CONFIG_TMPFS_XATTR
           CONFIG_{TMPFS,EXT4,XFS,BTRFS_FS,...}_POSIX_ACL
           CONFIG_SECCOMP
+          CONFIG_CHECKPOINT_RESTORE (for the kcmp() syscall)
 
         Required for CPUShares in resource control unit settings
           CONFIG_CGROUP_SCHED