diff --git a/specs/phase1/beacon-chain.md b/specs/phase1/beacon-chain.md
index 32e9c925b..9ca4b1e39 100644
--- a/specs/phase1/beacon-chain.md
+++ b/specs/phase1/beacon-chain.md
@@ -995,6 +995,7 @@ def process_epoch(state: BeaconState) -> None:
     process_rewards_and_penalties(state)
     process_registry_updates(state)
     process_reveal_deadlines(state)
+    process_challenge_deadlines(state)
     process_slashings(state)
     process_final_updates(state)
     process_custody_final_updates(state)