diff --git a/contracts/ownership/Ownable.sol b/contracts/ownership/Ownable.sol
index 65537ea..85780ef 100644
--- a/contracts/ownership/Ownable.sol
+++ b/contracts/ownership/Ownable.sol
@@ -15,14 +15,14 @@ contract Ownable is Initializable {
     address private _owner;
 
     /**
-     * @dev The caller is not the owner.
+     * @dev The caller account is not authorized to perform an operation.
      */
-    error NotOwner();
+    error OwnableUnauthorizedAccount(address account);
 
     /**
-     * @dev Given zero address.
+     * @dev The owner is not a valid owner account. (eg. `address(0)`)
      */
-    error ZeroAddress();
+    error OwnableInvalidOwner(address owner);
 
     event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
 
@@ -46,7 +46,7 @@ contract Ownable is Initializable {
      */
     modifier onlyOwner() {
         if (!isOwner()) {
-            revert NotOwner();
+            revert OwnableUnauthorizedAccount(msg.sender);
         }
         _;
     }
@@ -83,7 +83,7 @@ contract Ownable is Initializable {
      */
     function _transferOwnership(address newOwner) internal {
         if (newOwner == address(0)) {
-            revert ZeroAddress();
+            revert OwnableInvalidOwner(address(0));
         }
         emit OwnershipTransferred(_owner, newOwner);
         _owner = newOwner;
diff --git a/test/NodeDriver.ts b/test/NodeDriver.ts
index 23a04ea..937d2bd 100644
--- a/test/NodeDriver.ts
+++ b/test/NodeDriver.ts
@@ -40,7 +40,7 @@ describe('NodeDriver', () => {
       const account = ethers.Wallet.createRandom();
       await expect(this.nodeDriverAuth.connect(this.nonOwner).migrateTo(account)).to.be.revertedWithCustomError(
         this.nodeDriverAuth,
-        'NotOwner',
+        'OwnableUnauthorizedAccount',
       );
     });
   });
@@ -55,7 +55,7 @@ describe('NodeDriver', () => {
       const address = ethers.Wallet.createRandom();
       await expect(
         this.nodeDriverAuth.connect(this.nonOwner).copyCode(this.sfc, address),
-      ).to.be.revertedWithCustomError(this.nodeDriverAuth, 'NotOwner');
+      ).to.be.revertedWithCustomError(this.nodeDriverAuth, 'OwnableUnauthorizedAccount');
     });
   });
 
@@ -69,7 +69,7 @@ describe('NodeDriver', () => {
     it('Should revert when not owner', async function () {
       await expect(this.nodeDriverAuth.connect(this.nonOwner).updateNetworkVersion(1)).to.be.revertedWithCustomError(
         this.nodeDriverAuth,
-        'NotOwner',
+        'OwnableUnauthorizedAccount',
       );
     });
   });
@@ -82,7 +82,7 @@ describe('NodeDriver', () => {
     it('Should revert when not owner', async function () {
       await expect(this.nodeDriverAuth.connect(this.nonOwner).advanceEpochs(10)).to.be.revertedWithCustomError(
         this.nodeDriverAuth,
-        'NotOwner',
+        'OwnableUnauthorizedAccount',
       );
     });
   });
diff --git a/test/SFC.ts b/test/SFC.ts
index 201c88c..d18df86 100644
--- a/test/SFC.ts
+++ b/test/SFC.ts
@@ -292,15 +292,14 @@ describe('SFC', () => {
     it('Should revert when transferring ownership if not owner', async function () {
       await expect(this.sfc.connect(this.user).transferOwnership(ethers.ZeroAddress)).to.be.revertedWithCustomError(
         this.nodeDriverAuth,
-        'NotOwner',
+        'OwnableUnauthorizedAccount',
       );
     });
 
     it('Should revert when transferring ownership to zero address', async function () {
-      await expect(this.sfc.transferOwnership(ethers.ZeroAddress)).to.be.revertedWithCustomError(
-        this.nodeDriverAuth,
-        'ZeroAddress',
-      );
+      await expect(this.sfc.transferOwnership(ethers.ZeroAddress))
+        .to.be.revertedWithCustomError(this.nodeDriverAuth, 'OwnableInvalidOwner')
+        .withArgs(ethers.ZeroAddress);
     });
   });