From 9cafb41e060c3b96c145492d95e8e5c60ea0b6fc Mon Sep 17 00:00:00 2001
From: Nathan Baker <nathanandrewbaker@gmail.com>
Date: Sat, 16 May 2020 16:49:47 -0700
Subject: [PATCH] Document acceptable error in PROPKA tests.

Addresses
https://github.com/jensengroup/propka-3.1/pull/29#discussion_r424572620
---
 Tests/pkacalc_test.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Tests/pkacalc_test.py b/Tests/pkacalc_test.py
index 05d107b..8fd4e37 100644
--- a/Tests/pkacalc_test.py
+++ b/Tests/pkacalc_test.py
@@ -7,6 +7,8 @@ import unittest
 import logging
 
 
+# This error tolerance was chosen to make Ubuntu 18.04 pass under Windows 
+# Subsystem Linux.
 ACCEPTABLE_ERROR = 0.001