diff --git a/lib/protocol/networks.js b/lib/protocol/networks.js
index 6db197cc9..54c6b4532 100644
--- a/lib/protocol/networks.js
+++ b/lib/protocol/networks.js
@@ -118,7 +118,9 @@ main.checkpointMap = {
   // DAA fork block
   504031: b('9cabb6ee1b1a4c3b659d70be75810be83d0a0db665bf1e010000000000000000'),
   510000: b('040e6b1f2f4cb198a5780d366bf81e591de257642b9267030000000000000000'),
-  525000: b('c994fba2bf168333fd969bcfa64f03ca1b62074f9a8f1b010000000000000000')
+  525000: b('c994fba2bf168333fd969bcfa64f03ca1b62074f9a8f1b010000000000000000'),
+  // Monolith Activation
+  530359: b('0391c40195cf8ae3436f3955f1a8444f07468fd08bda1a010000000000000000')
 };
 
 /**
@@ -552,8 +554,10 @@ testnet.checkpointMap = {
     b('41f83c47e02a8852d033ac884df7cca877726b384a461fb9e802000000000000'),
   1130000:
     b('b8d63c3830e3c5685d3f7d2c2271fdb2ce3315619a473c324ea1a4ce00000000'),
+  // UAHF fork block.
   1155875:
     b('38f1ae7f0ea8c1b589884c5fbd0b83721e3ab6759a4b897206857cf100000000'),
+  // DAA fork block.
   1188697:
     b('fb47e0ab0d2448f71192a09fe61bc9c46cd3b4e7bd778091d00e170000000000')
 };