#3912: document default for *places* arg.
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 3f4a6ac..792a98e 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -595,7 +595,8 @@
TestCase.failUnlessAlmostEqual(first, second[, places[, msg]])
Test that *first* and *second* are approximately equal by computing the
- difference, rounding to the given number of *places*, and comparing to zero.
+ difference, rounding to the given number of decimal *places* (default 7),
+ and comparing to zero.
Note that comparing a given number of decimal places is not the same as
comparing a given number of significant digits. If the values do not compare
equal, the test will fail with the explanation given by *msg*, or :const:`None`.
@@ -605,7 +606,8 @@
TestCase.failIfAlmostEqual(first, second[, places[, msg]])
Test that *first* and *second* are not approximately equal by computing the
- difference, rounding to the given number of *places*, and comparing to zero.
+ difference, rounding to the given number of decimal *places* (default 7),
+ and comparing to zero.
Note that comparing a given number of decimal places is not the same as
comparing a given number of significant digits. If the values do not compare
equal, the test will fail with the explanation given by *msg*, or :const:`None`.