add link to pr

Author: molly-moen

packages/unittest_runner/unittest_runner/validation_runner.py

@@ -5,6 +5,7 @@ class ValidationTestResult(TextTestResult):
   # The default behavior is to display the test name and short description.
   # We want to display only the short description if it exists, otherwise just the test name.
   # Students don't see the tests, so we don't need to display the test name.
+  # See this PR for details: https://github.com/code-dot-org/pythonlab-packages/pull/3
   def getDescription(self, test):
     doc_first_line = test.shortDescription()
     if doc_first_line: