diff --git a/specs/altair/beacon-chain.md b/specs/altair/beacon-chain.md
index 9f9af9de7..e14a0f5c0 100644
--- a/specs/altair/beacon-chain.md
+++ b/specs/altair/beacon-chain.md
@@ -663,9 +663,11 @@ def process_sync_committee_updates(state: BeaconState) -> None:
         state.next_sync_committee = get_sync_committee(state, next_epoch + EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
 ```
 
-## Initialize state for testnets
+## Initialize state for Altair testnets
 
-This helper function is only for initialize Altair testnets and tests.
+This helper function is only for initializing the pure Altair testnets and tests, where we use the dummy where the `ALTAIR_FORK_SLOT` GENESIS_SLOT`.
+
+*Note*: The function `initialize_beacon_state_from_eth1` is modified with `ALTAIR_FORK_VERSION` fork version and initial sync committees. 
 
 ```python
 def initialize_beacon_state_from_eth1(eth1_block_hash: Bytes32,