diff --git a/sheets/mount b/sheets/mount
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index 0000000..59bd278
--- /dev/null
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+# mount
+# Mount a filesystem
+
+# Mount a temporary filesystem (TMPFS) of 4GB to '/mnt'. The contents will
+# vanish when you reboot, but this can be very useful when working with things
+# like bootstrap tarballs or temporary storages for sensitive data.
+mount -t tmpfs -o mode=755,size=4096M tmpfs /mnt