diff --git a/contracts/staking/CHANGELOG.json b/contracts/staking/CHANGELOG.json
index 2a953327fb..c09b42b1a5 100644
--- a/contracts/staking/CHANGELOG.json
+++ b/contracts/staking/CHANGELOG.json
@@ -49,6 +49,10 @@
             {
                 "note": "Refactored Staking Reward Vault. Moved pool management logic into staking contract.",
                 "pr": 2156
+            },
+            {
+                "note": "Removed MixinStakingPoolRewardVault.sol",
+                "pr": 2156
             }
         ]
     }
diff --git a/contracts/staking/contracts/src/interfaces/IStakingEvents.sol b/contracts/staking/contracts/src/interfaces/IStakingEvents.sol
index 9203436d9c..a017b66a32 100644
--- a/contracts/staking/contracts/src/interfaces/IStakingEvents.sol
+++ b/contracts/staking/contracts/src/interfaces/IStakingEvents.sol
@@ -146,14 +146,4 @@ interface IStakingEvents {
         uint32 oldOperatorShare,
         uint32 newOperatorShare
     );
-
-    /// @dev Emitted when an operator reward is transferred to the Eth vault.
-    /// @param amount The amount in ETH withdrawn.
-    /// @param operator of the pool.
-    /// @param poolId The pool the reward was deposited for.
-    event OperatorRewardTransferredToEthVault(
-        bytes32 poolId,
-        address operator,
-        uint256 amount
-    );
 }
diff --git a/contracts/staking/contracts/src/interfaces/IStructs.sol b/contracts/staking/contracts/src/interfaces/IStructs.sol
index cdd4aec185..df4deb2b49 100644
--- a/contracts/staking/contracts/src/interfaces/IStructs.sol
+++ b/contracts/staking/contracts/src/interfaces/IStructs.sol
@@ -97,7 +97,7 @@ interface IStructs {
     }
 
     /// @dev Holds the metadata for a staking pool.
-    /// @param initialzed True iff the balance struct is initialized.
+    /// @param initialized True iff the balance struct is initialized.
     /// @param operator of the pool.
     /// @param operatorShare Fraction of the total balance owned by the operator, in ppm.
     /// @param numberOfMakers Number of makers in the pool.
diff --git a/contracts/staking/contracts/src/staking_pools/MixinStakingPool.sol b/contracts/staking/contracts/src/staking_pools/MixinStakingPool.sol
index 2b3a134b0b..f4ff80b55a 100644
--- a/contracts/staking/contracts/src/staking_pools/MixinStakingPool.sol
+++ b/contracts/staking/contracts/src/staking_pools/MixinStakingPool.sol
@@ -113,6 +113,8 @@ contract MixinStakingPool is
         return nextPoolId;
     }
 
+    /// @dev Returns a staking pool
+    /// @param poolId Unique id of pool.
     function getStakingPool(bytes32 poolId)
         public
         view
@@ -132,6 +134,8 @@ contract MixinStakingPool is
         return bytes32(uint256(poolId).safeAdd(POOL_ID_INCREMENT_AMOUNT));
     }
 
+    /// @dev Reverts iff a staking pool does not exist.
+    /// @param poolId Unique id of pool.
     function _assertStakingPoolExists(bytes32 poolId)
         internal
         view
@@ -148,6 +152,10 @@ contract MixinStakingPool is
         }
     }
 
+    /// @dev Reverts iff the new operator share is invalid.
+    /// @param poolId Unique id of pool.
+    /// @param currentOperatorShare Current operator share.
+    /// @param newOperatorShare New operator share.
     function _assertNewOperatorShare(
         bytes32 poolId,
         uint32 currentOperatorShare,
diff --git a/contracts/staking/contracts/src/staking_pools/MixinStakingPoolRewards.sol b/contracts/staking/contracts/src/staking_pools/MixinStakingPoolRewards.sol
index 45a5886a67..93b723c929 100644
--- a/contracts/staking/contracts/src/staking_pools/MixinStakingPoolRewards.sol
+++ b/contracts/staking/contracts/src/staking_pools/MixinStakingPoolRewards.sol
@@ -32,6 +32,8 @@ contract MixinStakingPoolRewards is
 
     /// @dev Syncs rewards for a delegator. This includes transferring rewards from
     /// the Reward Vault to the Eth Vault, and adding/removing dependencies on cumulative rewards.
+    /// This is used by a delegator when they want to sync their rewards without delegating/undelegating.
+    /// It's effectively the same as delegating zero stake.
     /// @param poolId Unique id of pool.
     function syncDelegatorRewards(bytes32 poolId)
         external
diff --git a/contracts/staking/test/actors/pool_operator_actor.ts b/contracts/staking/test/actors/pool_operator_actor.ts
index 86d6078c88..bd74e5bb17 100644
--- a/contracts/staking/test/actors/pool_operator_actor.ts
+++ b/contracts/staking/test/actors/pool_operator_actor.ts
@@ -1,5 +1,5 @@
 import { expect } from '@0x/contracts-test-utils';
-import { BigNumber, RevertError } from '@0x/utils';
+import { RevertError } from '@0x/utils';
 import * as _ from 'lodash';
 
 import { constants as stakingConstants } from '../utils/constants';
@@ -35,9 +35,7 @@ export class PoolOperatorActor extends BaseActor {
             );
             expect(poolIdOfMaker, 'pool id of maker').to.be.equal(poolId);
             // check the number of makers in the pool
-            const pool = await this._stakingApiWrapper.stakingContract.getStakingPool.callAsync(
-                poolId,
-            );
+            const pool = await this._stakingApiWrapper.stakingContract.getStakingPool.callAsync(poolId);
             expect(pool.numberOfMakers, 'number of makers in pool').to.be.bignumber.equal(1);
         }
         return poolId;
diff --git a/contracts/staking/test/rewards_test.ts b/contracts/staking/test/rewards_test.ts
index cb71829ca4..86ce5e9d0a 100644
--- a/contracts/staking/test/rewards_test.ts
+++ b/contracts/staking/test/rewards_test.ts
@@ -113,12 +113,6 @@ blockchainTests.resets('Testing Rewards', env => {
                         ? _expectedEndBalances.poolRewardVaultBalance
                         : ZERO,
             };
-            /*
-            const pool = await stakingApiWrapper.stakingContract.getStakingPool.callAsync(poolId);
-            const operatorBalance = pool[2];
-            const membersBalance = pool[3];
-            const poolBalances = { poolBalance: operatorBalance.plus(membersBalance), operatorBalance, membersBalance };
-            */
             const finalEndBalancesAsArray = await Promise.all([
                 // staker 1
                 stakingApiWrapper.stakingContract.computeRewardBalanceOfDelegator.callAsync(