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+.TH ean13 1 2024-03-15 utils
+
+.SH NAME
+ean13 \- check or compute european article numbers
+
+.SH SYNOPSIS
+.B ean13
+.RI [ arg\ ... ]
+
+.SH DESCRIPTION
+.B ean13
+checks for each argument if it is a valid EAN13 number,
+that is a European Article Number that has 13 digits;
+or computes the checksum digit if the argument has only 12 digits. 
+
+.SH EXIT STATUS
+.TP
+.B 0
+If the number is valid or the checksum is computed.
+
+.TP
+.B 1
+If the number is not valid.
+
+.SH EXAMPLES
+.HP
+Compute the checksum number:
+
+.BR ean13 \ 012345678901
+
+.HP
+Check if the number is a valid EAN13:
+
+.BR ean13 \ 0123456789012
+