diff --git a/app/utils/classification_rules.py b/app/utils/classification_rules.py
index 4c8f61c2..d8f440ab 100644
--- a/app/utils/classification_rules.py
+++ b/app/utils/classification_rules.py
@@ -31,7 +31,7 @@ logger = logging.getLogger(__name__)
 # Pre-built categories
 # ---------------------------------------------------------------------------
 
-#: Canonical category names recognised by the system.  Users may also define
+#: Canonical category names recognized by the system.  Users may also define
 #: their own categories via custom rules.
 BUILTIN_CATEGORIES: dict[str, str] = {
     "invoice": "Invoice",
diff --git a/tests/test_classification_rules.py b/tests/test_classification_rules.py
index 1005022e..a4bacaec 100644
--- a/tests/test_classification_rules.py
+++ b/tests/test_classification_rules.py
@@ -104,7 +104,7 @@ class TestFilenamePatternMatching:
         result = classify_document(filename="Payment_Receipt.pdf")
         assert result.category == "receipt"
 
-    def test_unrecognised_filename(self):
+    def test_unrecognized_filename(self):
         """A generic filename with no keywords should return 'unknown'."""
         result = classify_document(filename="document_12345.pdf")
         assert result.category == "unknown"