diff --git a/beacon_chain/spec/helpers.nim b/beacon_chain/spec/helpers.nim
index 3823875bf..2cb62b0c6 100644
--- a/beacon_chain/spec/helpers.nim
+++ b/beacon_chain/spec/helpers.nim
@@ -72,7 +72,6 @@ func is_active_validator*(validator: Validator, epoch: Epoch): bool =
   ### Check if ``validator`` is active
   validator.activation_epoch <= epoch and epoch < validator.exit_epoch
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.7.1/specs/core/0_beacon-chain.md#get_active_validator_indices
 # https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#get_active_validator_indices
 func get_active_validator_indices*(state: BeaconState, epoch: Epoch):
     seq[ValidatorIndex] =
diff --git a/beacon_chain/spec/presets/mainnet.nim b/beacon_chain/spec/presets/mainnet.nim
index 4b5fde8de..79e3f73fb 100644
--- a/beacon_chain/spec/presets/mainnet.nim
+++ b/beacon_chain/spec/presets/mainnet.nim
@@ -22,7 +22,6 @@ type
 
 {.experimental: "codeReordering".} # SLOTS_PER_EPOCH is use before being defined in spec
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.7.1/configs/constant_presets/mainnet.yaml
 const
   # Misc
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/minimal.nim b/beacon_chain/spec/presets/minimal.nim
index 301e865aa..faec976f4 100644
--- a/beacon_chain/spec/presets/minimal.nim
+++ b/beacon_chain/spec/presets/minimal.nim
@@ -22,7 +22,6 @@ type
 
 {.experimental: "codeReordering".} # SLOTS_PER_EPOCH is use before being defined in spec
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.7.1/configs/constant_presets/minimal.yaml
 const
   # Misc
   # ---------------------------------------------------------------