diff --git a/man5/filesystems.5 b/man5/filesystems.5
index 976957e05..99ea442c9 100644
--- a/man5/filesystems.5
+++ b/man5/filesystems.5
@@ -185,6 +185,13 @@ long filenames, UID/GID, POSIX permissions, and special files
 (devices, named pipes, etc.)  under the DOS filesystem, without
 sacrificing compatibility with DOS.
 .TP
+.B tmpfs
+is a filesystem whose contents reside in virtual memory.
+Since the files on such filesystems typically reside in RAM,
+file access is extremely fast.
+See
+.BR tmpfs (5).
+.TP
 .B vfat
 is an extended FAT filesystem used by Microsoft Windows95 and Windows NT.
 .B vfat