diff --git a/conservancy_beancount/reports/accrual.py b/conservancy_beancount/reports/accrual.py
index 806b1460a9a5a2200cee27952a3e1bccec9dda7d..ec2530679cc74cca5dea8d7e5f00e01a9ce71393 100644
--- a/conservancy_beancount/reports/accrual.py
+++ b/conservancy_beancount/reports/accrual.py
@@ -178,8 +178,6 @@ class AccrualPostings(core.RelatedPostings):
                  _can_own: bool=False,
     ) -> None:
         super().__init__(source, _can_own=_can_own)
-        # The following type declarations tell mypy about values set in the for
-        # loop that are important enough to be referenced directly elsewhere.
         self.account = self._single_item(post.account for post in self)
         if isinstance(self.account, Sentinel):
             self.accrual_type: Optional[AccrualAccount] = None
@@ -218,9 +216,7 @@ class AccrualPostings(core.RelatedPostings):
         # value like "FIXME". It can be refined if needed.
         invoice_ok = isinstance(self.invoice, str) and '/' in self.invoice
         if account_ok and entity_ok and invoice_ok:
-            # mypy loses track of the fact that self.invoice must be a str in
-            # this case (gated on the invoice_ok boolean) and complains it
-            # doesn't match the type of the return value.
+            # type ignore for <https://github.com/python/mypy/issues/6670>
             yield (self.invoice, self)  # type:ignore[misc]
             return
         groups = collections.defaultdict(list)