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+.TH sum-down 1 2022-01-12 utils
+
+.SH NAME
+sum-down \- add up columns in a table
+
+.SH SYNOPSIS
+.B sum-down
+.RI [ file\ ... ]
+
+.SH DESCRIPTION
+.B sum-down
+reads a table from the specified files or,
+if none are specified, stdin,
+and outputs the sum of
+each column.
+
+It is implemented using
+.BR awk (1).
+
+.SH EXAMPLES
+.B sum-down
+.RI < \ table.tsv
+
+.SH SEE ALSO
+.BR sum-up (1)