Index: head/lib/msun/man/log.3
===================================================================
--- head/lib/msun/man/log.3	(revision 359325)
+++ head/lib/msun/man/log.3	(revision 359326)
@@ -1,137 +1,148 @@
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-.Dd June 3, 2013
+.Dd March 22, 2020
 .Dt LOG 3
 .Os
 .Sh NAME
 .Nm log ,
 .Nm logf ,
 .Nm logl ,
 .Nm log10 ,
 .Nm log10f ,
 .Nm log10l ,
 .Nm log2 ,
 .Nm log2f ,
 .Nm log2l ,
 .Nm log1p ,
 .Nm log1pf ,
 .Nm log1pl
 .Nd logarithm functions
 .Sh LIBRARY
 .Lb libm
 .Sh SYNOPSIS
 .In math.h
 .Ft double
 .Fn log "double x"
 .Ft float
 .Fn logf "float x"
 .Ft long double
 .Fn logl "long double x"
 .Ft double
 .Fn log10 "double x"
 .Ft float
 .Fn log10f "float x"
 .Ft long double
 .Fn log10l "long double x"
 .Ft double
 .Fn log2 "double x"
 .Ft float
 .Fn log2f "float x"
 .Ft long double
 .Fn log2l "long double x"
 .Ft double
 .Fn log1p "double x"
 .Ft float
 .Fn log1pf "float x"
 .Ft long double
 .Fn log1pl "long double x"
 .Sh DESCRIPTION
 The
 .Fn log ,
 .Fn logf ,
 and
 .Fn logl
 functions compute the natural logarithm of
 .Fa x .
 .Pp
 The
 .Fn log10 ,
 .Fn log10f ,
 and
 .Fn log10l
 functions compute the logarithm base 10 of
 .Fa x ,
 while
 .Fn log2 ,
 .Fn log2f ,
 and
 .Fn log2l
 compute the logarithm base 2 of
 .Fa x .
 .Pp
 The
 .Fn log1p ,
 .Fn log1pf ,
 and
 .Fn log1pl
 functions compute the natural logarithm of
 .No "1 + x" .
 Computing the natural logarithm as
 .Li log1p(x)
 is more accurate than computing it as
 .Li log(1 + x)
 when
 .Fa x
 is close to zero.
 .Sh RETURN VALUES
 These functions return the requested logarithm; the logarithm of 1 is +0.
 An attempt to take the logarithm of \*(Pm0 results in a divide-by-zero
 exception, and -\*(If is returned.
 Otherwise, attempting to take the logarithm of a negative number
 results in an invalid exception and a return value of \*(Na.
 .Sh SEE ALSO
 .Xr exp 3 ,
 .Xr ilogb 3 ,
 .Xr math 3 ,
 .Xr pow 3
 .Sh STANDARDS
 The
 .Fn log ,
 .Fn logf ,
 .Fn logl ,
 .Fn log10 ,
 .Fn log10f ,
 .Fn log10l ,
 .Fn log2 ,
 .Fn log2f ,
 .Fn log2l ,
 .Fn log1p ,
 .Fn log1pf ,
 and
 .Fn log1pl
 functions conform to
 .St -isoC-99 .
+.Sh HISTORY
+The
+.Fn log
+function first appeared in
+.At v1 ;
+.Fn log10
+in
+.At v7 ;
+.Fn log1p
+in
+.Bx 4.3 .