diff --git a/backend/src/cyclone/store/exceptions.py b/backend/src/cyclone/store/exceptions.py
index 998906f..e8eb1c1 100644
--- a/backend/src/cyclone/store/exceptions.py
+++ b/backend/src/cyclone/store/exceptions.py
@@ -44,7 +44,7 @@ class InvalidStateError(Exception):
 
 
 class DuplicateClaimError(Exception):
-    """Raised by ``CycloneStore.check_submission_duplicate`` when a claim_id
+    """Raised by ``cyclone.store.submission_dedup.check_duplicate`` when a claim_id
     is re-submitted within the 30-day dedup window (SP41).
 
     Mirrors the other 409-class exceptions: callers catch it at the API
@@ -63,4 +63,4 @@ class DuplicateClaimError(Exception):
         super().__init__(
             f"claim_id {claim_id!r} was already submitted at "
             f"{original_submission_at.isoformat()}; within 30-day window"
-        )
\ No newline at end of file
+        )
diff --git a/backend/src/cyclone/store/submission_dedup.py b/backend/src/cyclone/store/submission_dedup.py
index 2712ad8..db97a18 100644
--- a/backend/src/cyclone/store/submission_dedup.py
+++ b/backend/src/cyclone/store/submission_dedup.py
@@ -62,4 +62,4 @@ def check_duplicate(
             )
         ).first()
     if row is not None:
-        raise DuplicateClaimError(claim_id, row.submitted_at)
\ No newline at end of file
+        raise DuplicateClaimError(claim_id, row.submitted_at)