diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index daa1bc108..5ca59c66b 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1014,7 +1014,13 @@ def get_beacon_proposer_index(state: BeaconState,
 
     assert previous_epoch <= epoch <= next_epoch
 
-    first_committee, _ = get_crosslink_committees_at_slot(state, slot, registry_change)[0]
+    first_committee, _ = get_crosslink_committees_at_slot(state, slot, registry_change)[0]    i = 0
+    while i < len(first_committee):
+        rand_byte = hash(generate_seed(get_current_epoch(state)) + int_to_bytes8(i // 32))[i % 32]
+        candidate = first_committee[(epoch % i) % len(first_committee)]
+        if get_effective_balance(state, candidate) * 256 > MAX_DEPOSIT_AMOUNT * rand_byte:
+            return candidate
+        i += 1
     return first_committee[epoch % len(first_committee)]
 ```