diff --git a/share/man/man5/tmpfs.5 b/share/man/man5/tmpfs.5
index bf07f06de02..c01aefd8550 100644
--- a/share/man/man5/tmpfs.5
+++ b/share/man/man5/tmpfs.5
@@ -112,6 +112,12 @@ file systems:
 .It Cm easize
 Set the maximum memory size used by extended attributes in bytes.
 The default is 16 megabytes.
+.It Cm export
+Accept the
+.Cm export
+option for compatibility with
+.Xr nfsv4 4 .
+This option does nothing.
 .It Cm gid
 Set the group ID of the root inode of the file system.
 The default is the mount point's GID.