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+.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
+.\"
+.\" SPDX-License-Identifier: GPL-1.0-or-later
+.\"
+.TH clog2 3 2023-10-31 "Linux man-pages 6.06"
+.SH NAME
+clog2, clog2f, clog2l \- base-2 logarithm of a complex number
+.SH LIBRARY
+Math library
+.RI ( libm ", " \-lm )
+.SH SYNOPSIS
+.nf
+.B #include <complex.h>
+.P
+.BI "double complex clog2(double complex " z );
+.BI "float complex clog2f(float complex " z );
+.BI "long double complex clog2l(long double complex " z );
+.fi
+.SH DESCRIPTION
+The call
+.I clog2(z)
+is equivalent to
+.IR clog(z)/log(2) .
+.P
+The other functions perform the same task for
+.I float
+and
+.IR "long double" .
+.P
+Note that
+.I z
+close to zero will cause an overflow.
+.SH STANDARDS
+None.
+.SH HISTORY
+These function names are reserved for future use in C99.
+.P
+Not yet in glibc, as at glibc 2.19.
+.\" But reserved in NAMESPACE.
+.SH SEE ALSO
+.BR cabs (3),
+.BR cexp (3),
+.BR clog (3),
+.BR clog10 (3),
+.BR complex (7)