diff --git a/src/ga4gh/va_spec/base/validators.py b/src/ga4gh/va_spec/base/validators.py
index 8e18ec5..997e8bd 100644
--- a/src/ga4gh/va_spec/base/validators.py
+++ b/src/ga4gh/va_spec/base/validators.py
@@ -127,8 +127,8 @@ def _validate_method_type_evidence_outcome(
             not valid for the specified method type, or if method type is invalid
         """
         try:
-            parsed_method_type = cls.MethodType[method_type.upper()]
-        except KeyError as e:
+            parsed_method_type = cls.MethodType(method_type)
+        except ValueError as e:
             msg = f"{method_type!r} is not a valid {cls.__qualname__}.MethodType"
             raise ValueError(msg) from e
         allowed_criteria = cls.ALLOWED_CRITERIA_BY_METHOD_TYPE[parsed_method_type]
diff --git a/src/ga4gh/va_spec/ccv_2022/models.py b/src/ga4gh/va_spec/ccv_2022/models.py
index 86ed3f3..df3db3d 100644
--- a/src/ga4gh/va_spec/ccv_2022/models.py
+++ b/src/ga4gh/va_spec/ccv_2022/models.py
@@ -272,6 +272,7 @@ class VariantOncogenicityStatement(CCV2022MetadataMixin, Statement):
     )
     classification: MappableConcept | iriReference = Field(
         ...,
+        description="A single term or phrase classifying the subject variant based on the result of direction and strength assessments of the Statement's Proposition, using terms from the ClinGen/CGC/VICC 2022 Guidelines for Oncogenicity.",
     )
     specifiedBy: Method | iriReference = Field(
         ...,