diff --git a/configs/mainnet.yaml b/configs/mainnet.yaml
index 365bc11367..9206ab77da 100644
--- a/configs/mainnet.yaml
+++ b/configs/mainnet.yaml
@@ -53,6 +53,9 @@ DENEB_FORK_EPOCH: 18446744073709551615
 # EIP6110
 EIP6110_FORK_VERSION: 0x05000000  # temporary stub
 EIP6110_FORK_EPOCH: 18446744073709551615
+# WHISK
+WHISK_FORK_VERSION: 0x06000000  # temporary stub
+WHISK_FORK_EPOCH: 18446744073709551615
 
 
 # Time parameters
diff --git a/configs/minimal.yaml b/configs/minimal.yaml
index b22a7165e1..256a39d1c1 100644
--- a/configs/minimal.yaml
+++ b/configs/minimal.yaml
@@ -52,6 +52,9 @@ DENEB_FORK_EPOCH: 18446744073709551615
 # EIP6110
 EIP6110_FORK_VERSION: 0x05000001
 EIP6110_FORK_EPOCH: 18446744073709551615
+# WHISK
+WHISK_FORK_VERSION: 0x06000001
+WHISK_FORK_EPOCH: 18446744073709551615
 
 
 # Time parameters
diff --git a/specs/_features/whisk/beacon-chain.md b/specs/_features/whisk/beacon-chain.md
index bad8188378..8019b194ca 100644
--- a/specs/_features/whisk/beacon-chain.md
+++ b/specs/_features/whisk/beacon-chain.md
@@ -23,6 +23,7 @@
     - [`BeaconBlockBody`](#beaconblockbody)
   - [Deposits](#deposits)
   - [`get_beacon_proposer_index`](#get_beacon_proposer_index)
+- [Testing](#testing)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 <!-- /TOC -->
@@ -469,3 +470,25 @@ def get_beacon_proposer_index(state: BeaconState) -> ValidatorIndex:
     assert state.latest_block_header.slot == state.slot  # sanity check `process_block_header` has been called
     return state.latest_block_header.proposer_index
 ```
+
+## Testing
+
+*Note*: The function `initialize_beacon_state_from_eth1` is modified for pure Whisk testing only.
+
+```python
+def initialize_beacon_state_from_eth1(eth1_block_hash: Hash32,
+                                      eth1_timestamp: uint64,
+                                      deposits: Sequence[Deposit],
+                                      execution_payload_header: ExecutionPayloadHeader=ExecutionPayloadHeader()
+                                      ) -> BeaconState:
+    state_capella = capella.initialize_beacon_state_from_eth1(
+        eth1_block_hash,
+        eth1_timestamp,
+        deposits,
+        execution_payload_header,
+    )
+    state = upgrade_to_whisk(state_capella)
+    state.fork.previous_version = WHISK_FORK_VERSION
+    state.fork.current_version = WHISK_FORK_VERSION
+    return state
+```