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diff --git a/benchtests/Makefile b/benchtests/Makefile
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+# Copyright (C) 2013 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+
+# Makefile for benchmark tests.  The only useful target here is `bench`.
+
+# Adding a new function `foo`:
+# ---------------------------
+
+# - Append the function name to the bench variable
+
+# - Define foo-ITER with the number of iterations you want to run.  Keep it
+#   high enough that the overhead of clock_gettime is only a small fraction of
+#   the total run time of the test.
+
+# - Define foo-ARGLIST as a colon separated list of types of the input
+#   arguments.  Use `void` if function does not take any inputs.  Put in quotes
+#   if the input argument is a pointer, e.g.:
+
+#      malloc-ARGLIST: "void *"
+
+# - Define foo-RET as the type the function returns.  Skip if the function
+#   returns void.  One could even skip foo-ARGLIST if the function does not
+#   take any inputs AND the function returns void.
+
+
+# - Make a file called `foo-inputs` with one input value per line, an input
+#   being a comma separated list of arguments to be passed into the function.
+#   See pow-inputs for an example.
+
+subdir := benchtests
+bench := exp pow
+
+exp-ITER = 100000
+exp-ARGLIST = double
+exp-RET = double
+LDFLAGS-bench-exp = -lm
+
+pow-ITER = 100000
+pow-ARGLIST = double:double
+pow-RET = double
+LDFLAGS-bench-pow = -lm
+
+include ../Makeconfig
+include ../Rules