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-rw-r--r--coverage/sqldata.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/coverage/sqldata.py b/coverage/sqldata.py
index 5d62b15b..5d7fbecf 100644
--- a/coverage/sqldata.py
+++ b/coverage/sqldata.py
@@ -596,7 +596,9 @@ class CoverageData(SimpleReprMixin):
"""Update this data with data from several other :class:`CoverageData` instances.
If `aliases` is provided, it's a `PathAliases` object that is used to
- re-map paths to match the local machine's.
+ re-map paths to match the local machine's. Note: `aliases` is None
+ only when called directly from the test suite.
+
"""
if self._debug.should("dataop"):
self._debug.write("Updating with data from {!r}".format(