From 3b9517ef7f5eb81677de9b81514c287905ad3314 Mon Sep 17 00:00:00 2001
From: Alex Gaynor <alex.gaynor@gmail.com>
Date: Sat, 8 Aug 2015 10:56:12 -0400
Subject: Provide a better error message here.

---
 src/cryptography/x509.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/cryptography/x509.py b/src/cryptography/x509.py
index 08a0c7c9..ddb50608 100644
--- a/src/cryptography/x509.py
+++ b/src/cryptography/x509.py
@@ -819,7 +819,8 @@ class DistributionPoint(object):
     def __init__(self, full_name, relative_name, reasons, crl_issuer):
         if full_name and relative_name:
             raise ValueError(
-                "At least one of full_name and relative_name must be None"
+                "You cannot provide both full_name and relative_name, at "
+                "least one must be None."
             )
 
         if full_name and not all(
-- 
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