diff --git a/core/embed/extmod/modtrezorcrypto/modtrezorcrypto-blake2b.h b/core/embed/extmod/modtrezorcrypto/modtrezorcrypto-blake2b.h
index 700b6f91b..5bcda3067 100644
--- a/core/embed/extmod/modtrezorcrypto/modtrezorcrypto-blake2b.h
+++ b/core/embed/extmod/modtrezorcrypto/modtrezorcrypto-blake2b.h
@@ -43,6 +43,7 @@ STATIC mp_obj_t mod_trezorcrypto_Blake2b_update(mp_obj_t self, mp_obj_t data);
 ///     self,
 ///     data: bytes = None,
 ///     outlen: int = blake2b.digest_size,
+///     key: bytes = None,
 ///     personal: bytes = None,
 /// ) -> None:
 ///     """
diff --git a/core/mocks/generated/trezorcrypto/__init__.pyi b/core/mocks/generated/trezorcrypto/__init__.pyi
index 4f29d66e0..f7b2c0b39 100644
--- a/core/mocks/generated/trezorcrypto/__init__.pyi
+++ b/core/mocks/generated/trezorcrypto/__init__.pyi
@@ -64,6 +64,7 @@ class blake2b:
         self,
         data: bytes = None,
         outlen: int = blake2b.digest_size,
+        key: bytes = None,
         personal: bytes = None,
     ) -> None:
         """