diff --git a/doc/guix.texi b/doc/guix.texi
index 2235b93a216..55eaabf0dbb 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -18443,7 +18443,7 @@ bits), @code{no-atime} (do not update file access times),
 @code{no-diratime} (likewise for directories only),
 @code{strict-atime} (update file access time), @code{lazy-time} (only
 update time on the in-memory version of the file inode),
-@code{no-exec} (disallow program execution), and @code{shared} (make the
+@code{no-exec} (disallow program execution), @code{remount} (remount a mounted file system), and @code{shared} (make the
 mount shared).
 @xref{Mount-Unmount-Remount,,, libc, The GNU C Library Reference
 Manual}, for more information on these flags.
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index 1ff954583a7..d25b798b117 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -1312,6 +1312,8 @@ corresponds to the symbols listed in FLAGS."
        (logior MS_STRICTATIME (loop rest)))
       (('lazy-time rest ...)
        (logior MS_LAZYTIME (loop rest)))
+      (('remount rest ...)
+       (logior MS_REMOUNT (loop rest)))
       (('shared rest ...)
        (loop rest))
       (()
diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm
index f4086dd62b7..f83b67c4770 100644
--- a/gnu/system/file-systems.scm
+++ b/gnu/system/file-systems.scm
@@ -123,7 +123,7 @@
     ;; Note: Keep in sync with 'mount-flags->bit-mask'.
     (let ((known-flags '(read-only
                          bind-mount no-suid no-dev no-exec
-                         no-atime no-diratime strict-atime lazy-time
+                         no-atime no-diratime strict-atime lazy-time remount
                          shared)))
       (lambda (flags)
         "Return the subset of FLAGS that is invalid."