diff --git a/proto/observer/observer.proto b/proto/observer/observer.proto
index 575eea04f1..b796a6705b 100644
--- a/proto/observer/observer.proto
+++ b/proto/observer/observer.proto
@@ -22,6 +22,7 @@ enum ObserverUpdateReason {
   AdminUpdate = 2;
 }
 
+// Deprecated: Use ObserverSet instead to get the list of observers
 message ObserverMapper {
   string index = 1;
   chains.Chain observer_chain = 2;
diff --git a/proto/pkg/chains/chains.proto b/proto/pkg/chains/chains.proto
index 2acee4565a..43473ca276 100644
--- a/proto/pkg/chains/chains.proto
+++ b/proto/pkg/chains/chains.proto
@@ -11,7 +11,7 @@ enum ReceiveStatus {
   Success = 1;
   Failed = 2;
 }
-
+// ChainName represents the name of the chain
 enum ChainName {
   option (gogoproto.goproto_enum_stringer) = true;
   empty = 0;
@@ -33,7 +33,7 @@ enum ChainName {
   btc_regtest = 15;
   amoy_testnet = 16;
 }
-
+// Network represents the network type of the chain
 enum Network {
   option (gogoproto.goproto_enum_stringer) = true;
   ETH = 0;
@@ -42,7 +42,7 @@ enum Network {
   POLYGON = 3;
   BSC = 4;
 }
-
+// NetworkType represents the network type of the chain
 enum NetworkType {
   option (gogoproto.goproto_enum_stringer) = true;
   MAINNET = 0;
@@ -50,13 +50,13 @@ enum NetworkType {
   PRIVNET = 2;
   DEVNET = 3;
 }
-
+// Vm represents the virtual machine type of the chain to support smart contracts
 enum Vm {
   option (gogoproto.goproto_enum_stringer) = true;
   NO_VM = 0;
   EVM = 1;
 }
-
+// Consensus represents the consensus algorithm used by the chain
 enum Consensus {
   option (gogoproto.goproto_enum_stringer) = true;
   Ethereum = 0;
@@ -64,6 +64,16 @@ enum Consensus {
   Bitcoin = 2;
 }
 
+//    Chain represents a blockchain network with its unique chain ID
+//    ChainName is the name of the chain
+//    ChainId is the unique identifier of the chain
+//    Network is the network type of the chain , this can be ZETA, ETH, BSC, BTC, POLYGON
+//    NetworkType is the network type of the chain, this can be MAINNET, TESTNET, DEVNET, PRIVNET
+//    Vm is the virtual machine type of the chain to support smart contracts, this can be EVM, NO_VM
+//    Consensus is the consensus algorithm used by the chain, this can be Tendermint, Ethereum, Bitcoin
+//    IsExternal is a boolean value to determine if the chain is external to Zeta
+//    IsHeaderSupported is a boolean value to determine if the chain supports headers
+
 message Chain {
   ChainName chain_name = 1;
   int64 chain_id = 2;