#5834: use "failure" instead of "error" because the two have different meanings in unittest context.
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index e24f37b..50314cd 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -609,7 +609,7 @@
assert_(expr[, msg])
failUnless(expr[, msg])
- Signal a test failure if *expr* is false; the explanation for the error
+ Signal a test failure if *expr* is false; the explanation for the failure
will be *msg* if given, otherwise it will be :const:`None`.
.. deprecated:: 2.7