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diff --git a/man3/finite.3 b/man3/finite.3
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.SH NAME
finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl \-
BSD floating-point classification functions
+.SH LIBRARY
+Math library
+.RI ( libm ", " -lm )
.SH SYNOPSIS
.nf
.B #include <math.h>