diff --git a/bin/ethlambda/assets/sepolia/config.yaml b/bin/ethlambda/assets/sepolia/config.yaml
index e6c17a836..bf938430a 100644
--- a/bin/ethlambda/assets/sepolia/config.yaml
+++ b/bin/ethlambda/assets/sepolia/config.yaml
@@ -25,8 +25,8 @@ ALTAIR_FORK_EPOCH: 50
 BELLATRIX_FORK_VERSION: 0x90000071
 BELLATRIX_FORK_EPOCH: 100
 TERMINAL_TOTAL_DIFFICULTY: 17000000000000000
-TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
-TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615
+TERMINAL_BLOCK_HASH: 0xd07cce9785d39c0dd2409b7d8e69d6bff26a69a0fa5308ac781c63ffe2a37bc1
+TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 3599
 
 # Capella
 CAPELLA_FORK_VERSION: 0x90000072
@@ -216,3 +216,10 @@ BLOB_SCHEDULE:
     MAX_BLOBS_PER_BLOCK: 15
   - EPOCH: 275712
     MAX_BLOBS_PER_BLOCK: 21
+
+# Gas limit scheduling
+# ---------------------------------------------------------------
+
+GAS_LIMIT_SCHEDULE:
+  - EPOCH: 353024
+    GAS_LIMIT: 200000000
diff --git a/bin/ethlambda/src/main.rs b/bin/ethlambda/src/main.rs
index b04084a6e..788f11006 100644
--- a/bin/ethlambda/src/main.rs
+++ b/bin/ethlambda/src/main.rs
@@ -1658,9 +1658,12 @@ fn first_config_difference(
         reorg_parent_weight_threshold: _,
         reorg_max_epochs_since_finalization: _,
 
-        // Transition (bellatrix): mainnet crossed this in 2022 and every
-        // shipped network leaves it at its default; not worth chain-identity
-        // treatment for the same reason the fork-choice group above is not.
+        // Transition (bellatrix): these only judge the merge transition block
+        // (`validate_merge_block`), and every shipped network is past its
+        // merge. Sepolia's file does set the `TERMINAL_BLOCK_HASH` override
+        // its merge used, but no block a node imports today is checked
+        // against it. Not worth chain-identity treatment for the same reason
+        // the fork-choice group above is not.
         terminal_total_difficulty: _,
         terminal_block_hash: _,
         terminal_block_hash_activation_epoch: _,