Be a little clearer about when we expect one thing, and when we expect a list

1 files changed, 4 insertions, 2 deletions

diff --git a/coverage/report.py b/coverage/report.py
index b93749c8..85d552e1 100644
--- a/coverage/report.py
+++ b/coverage/report.py
@@ -1,10 +1,12 @@
 """Reporter foundation for Coverage."""
 
 import os
-from coverage.codeunit import code_unit_factory
+
+from coverage.codeunit import code_units_factory
 from coverage.files import prep_patterns, FnmatchMatcher
 from coverage.misc import CoverageException, NoSource, NotPython
 
+
 class Reporter(object):
     """A base class for all reporters."""
 
@@ -34,7 +36,7 @@ class Reporter(object):
         morfs = morfs or self.coverage.data.measured_files()
         file_locator = self.coverage.file_locator
         get_plugin = self.coverage.data.plugin_data().get
-        self.code_units = code_unit_factory(morfs, file_locator, get_plugin)
+        self.code_units = code_units_factory(morfs, file_locator, get_plugin)
 
         if self.config.include:
             patterns = prep_patterns(self.config.include)