diff --git a/nucypher-core-python/nucypher_core/umbral.pyi b/nucypher-core-python/nucypher_core/umbral.pyi
index 7ced672..14bfd9b 100644
--- a/nucypher-core-python/nucypher_core/umbral.pyi
+++ b/nucypher-core-python/nucypher_core/umbral.pyi
@@ -260,3 +260,7 @@ class ReencryptionEvidence:
 
     kfrag_validity_message_hash: bytes
     kfrag_signature_v: bool
+
+
+class VerificationError(Exception):
+    pass
\ No newline at end of file