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-rw-r--r--python/fatcat_tools/references.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/fatcat_tools/references.py b/python/fatcat_tools/references.py
index 7e1f4f71..976967d4 100644
--- a/python/fatcat_tools/references.py
+++ b/python/fatcat_tools/references.py
@@ -68,7 +68,7 @@ class BiblioRef(BaseModel):
# skipped: target_wikipedia_article
# crossref, pubmed, grobid, etc
- match_provenance: str
+ match_provenance: Optional[str]
# strong, weak, etc
match_status: Optional[str]
# TODO: "match_strength"?