diff --git a/contracts/SequencerSet.sol b/contracts/SequencerSet.sol
index 362ca84..f7e3037 100644
--- a/contracts/SequencerSet.sol
+++ b/contracts/SequencerSet.sol
@@ -173,7 +173,7 @@ contract MetisSequencerSet is OwnableUpgradeable {
         }
 
         // check conditions
-        require(_newEpoch == curEpochId + 1, "Invalid epoch id");
+        require(_newEpoch == curEpochId + 1, "Invalid new epoch number");
         require(
             _endBlock > _startBlock,
             "End block must be greater than start block"
diff --git a/ts-src/test/SequencerSet.ts b/ts-src/test/SequencerSet.ts
index 651cb34..8df5bf0 100644
--- a/ts-src/test/SequencerSet.ts
+++ b/ts-src/test/SequencerSet.ts
@@ -150,7 +150,7 @@ describe("MetisSequencerSet", async () => {
 
     await expect(
       seqset.connect(mpc).commitEpoch(currentEpochNumber + 2n, 600, 799, seq1),
-    ).to.revertedWith("Invalid epoch id");
+    ).to.revertedWith("Invalid new epoch number");
 
     await expect(
       seqset.connect(mpc).commitEpoch(currentEpochNumber + 1n, 900, 799, seq1),