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-rw-r--r--Lib/test/cmath_testcases.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Lib/test/cmath_testcases.txt b/Lib/test/cmath_testcases.txt
index 2fabebf..e159380 100644
--- a/Lib/test/cmath_testcases.txt
+++ b/Lib/test/cmath_testcases.txt
@@ -43,6 +43,16 @@
-- ignored. Blank lines, or lines containing only whitespace, are also
-- ignored.
+-- The majority of the values below were computed with the help of
+-- version 2.3 of the MPFR library for multiple-precision
+-- floating-point computations with correct rounding. All output
+-- values in this file are (modulo yet-to-be-discovered bugs)
+-- correctly rounded, provided that each input and output decimal
+-- floating-point value below is interpreted as a representation of
+-- the corresponding nearest IEEE 754 double-precision value. See the
+-- MPFR homepage at http://www.mpfr.org for more information about the
+-- MPFR project.
+
--------------------------
-- acos: Inverse cosine --