From a8a80180893361567a83579b2b51cb97dc2620f7 Mon Sep 17 00:00:00 2001
From: Danny Ryan <dannyjryan@gmail.com>
Date: Wed, 22 Jan 2020 11:27:45 -0700
Subject: [PATCH] explicitly use Optiona type for fork_version in
 compute_domain

Co-Authored-By: Carl Beekhuizen <carl@ethereum.org>
---
 specs/phase0/beacon-chain.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/specs/phase0/beacon-chain.md b/specs/phase0/beacon-chain.md
index 478a2daa12..7f2e873bfb 100644
--- a/specs/phase0/beacon-chain.md
+++ b/specs/phase0/beacon-chain.md
@@ -788,7 +788,7 @@ def compute_activation_exit_epoch(epoch: Epoch) -> Epoch:
 #### `compute_domain`
 
 ```python
-def compute_domain(domain_type: DomainType, fork_version: Version=None) -> Domain:
+def compute_domain(domain_type: DomainType, fork_version: Optional[Version]=None) -> Domain:
     """
     Return the domain for the ``domain_type`` and ``fork_version``.
     """