diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 55791e25f..68e7ff484 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1151,6 +1151,9 @@ def get_delayed_activation_exit_epoch(epoch: Epoch) -> Epoch:
 
 ```python
 def get_churn_limit(state: BeaconState) -> int:
+    """
+    Return the churn limit based on the active validator count.
+    """
     return max(
         MIN_PER_EPOCH_CHURN_LIMIT,
         len(get_active_validator_indices(state, get_current_epoch(state))) // CHURN_LIMIT_QUOTIENT