diff --git a/packages/protocol/contracts/L1/tiers/LibTiers.sol b/packages/protocol/contracts/L1/tiers/LibTiers.sol
index 5a27302f1fc..fc118763b38 100644
--- a/packages/protocol/contracts/L1/tiers/LibTiers.sol
+++ b/packages/protocol/contracts/L1/tiers/LibTiers.sol
@@ -2,29 +2,23 @@
 pragma solidity 0.8.24;
 
 /// @title LibTiers
-/// @dev Tier ID cannot be zero!
+/// @dev Tier ID cannot be zero and must be unique.
 /// @custom:security-contact security@taiko.xyz
 library LibTiers {
     /// @notice Optimistic tier ID.
     uint16 public constant TIER_OPTIMISTIC = 100;
 
-    /// @notice SGX proof
+    /// @notice TEE tiers
+    /// Although these tiers have diffeerent IDs, at most one should be selected in a verifier.
     uint16 public constant TIER_SGX = 200;
-
-    /// @notice TDX proof
-    uint16 public constant TIER_TDX = 200;
-
-    /// @notice Any TEE proof
-    uint16 public constant TIER_TEE_ANY = 200;
-
-    /// @notice Risc0's ZKVM proof
-    uint16 public constant TIER_ZKVM_RISC0 = 290;
-
-    /// @notice SP1's ZKVM proof
-    uint16 public constant TIER_ZKVM_SP1 = 290;
-
-    /// @notice Any ZKVM proof
-    uint16 public constant TIER_ZKVM_ANY = 290;
+    uint16 public constant TIER_TDX = 201;
+    uint16 public constant TIER_TEE_ANY = 202;
+
+    /// @notice ZK Tiers.
+    /// Although these tiers have diffeerent IDs, at most one should be selected in a verifier.
+    uint16 public constant TIER_ZKVM_RISC0 = 250;
+    uint16 public constant TIER_ZKVM_SP1 = 251;
+    uint16 public constant TIER_ZKVM_ANY = 252;
 
     /// @notice Any ZKVM+TEE proof
     uint16 public constant TIER_ZKVM_AND_TEE = 300;