-.I Number
-copies the standard input to the standard output,
-changing each decimal number to a fully spelled out version.
+\fINumber\fP converts its arguments from decimal numbers to
+a fully spelled-out version. In the absence of arguments,
+\fInumber\fP reads from the standard input. Output is to
+the standard output.
+.SH BUGS
+\fINumber\fP doesn't understand about exponents.