diff --git a/lnrpc/lightning.pb.go b/lnrpc/lightning.pb.go
index 7a51acb49..f95a2593d 100644
--- a/lnrpc/lightning.pb.go
+++ b/lnrpc/lightning.pb.go
@@ -1355,7 +1355,9 @@ type LookupHtlcResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Settled  bool `protobuf:"varint,1,opt,name=settled,proto3" json:"settled,omitempty"`
+	// Settled is true is the htlc was settled. If false, the htlc was failed.
+	Settled bool `protobuf:"varint,1,opt,name=settled,proto3" json:"settled,omitempty"`
+	// Offchain indicates whether the htlc was resolved off-chain or on-chain.
 	Offchain bool `protobuf:"varint,2,opt,name=offchain,proto3" json:"offchain,omitempty"`
 }
 
diff --git a/lnrpc/lightning.proto b/lnrpc/lightning.proto
index 635741508..f16b97e46 100644
--- a/lnrpc/lightning.proto
+++ b/lnrpc/lightning.proto
@@ -582,6 +582,10 @@ service Lightning {
     */
     rpc ListAliases (ListAliasesRequest) returns (ListAliasesResponse);
 
+    /*
+    LookupHtlc retrieves a final htlc resolution from the database. If the htlc
+    has no final resolution yet, a NotFound grpc status code is returned.
+    */
     rpc LookupHtlc (LookupHtlcRequest) returns (LookupHtlcResponse);
 }
 
@@ -592,8 +596,10 @@ message LookupHtlcRequest {
 }
 
 message LookupHtlcResponse {
+    // Settled is true is the htlc was settled. If false, the htlc was failed.
     bool settled = 1;
 
+    // Offchain indicates whether the htlc was resolved off-chain or on-chain.
     bool offchain = 2;
 }
 
diff --git a/lnrpc/lightning.swagger.json b/lnrpc/lightning.swagger.json
index 90e8e317e..fed5e39cb 100644
--- a/lnrpc/lightning.swagger.json
+++ b/lnrpc/lightning.swagger.json
@@ -1603,6 +1603,7 @@
     },
     "/v1/htlc/{chan_id}/{htlc_index}": {
       "get": {
+        "summary": "LookupHtlc retrieves a final htlc resolution from the database. If the htlc\nhas no final resolution yet, a NotFound grpc status code is returned.",
         "operationId": "Lightning_LookupHtlc",
         "responses": {
           "200": {
@@ -5440,10 +5441,12 @@
       "type": "object",
       "properties": {
         "settled": {
-          "type": "boolean"
+          "type": "boolean",
+          "description": "Settled is true is the htlc was settled. If false, the htlc was failed."
         },
         "offchain": {
-          "type": "boolean"
+          "type": "boolean",
+          "description": "Offchain indicates whether the htlc was resolved off-chain or on-chain."
         }
       }
     },
diff --git a/lnrpc/lightning_grpc.pb.go b/lnrpc/lightning_grpc.pb.go
index a384a77f2..3190de55d 100644
--- a/lnrpc/lightning_grpc.pb.go
+++ b/lnrpc/lightning_grpc.pb.go
@@ -402,6 +402,8 @@ type LightningClient interface {
 	// their confirmed SCID (if it exists) and/or the base SCID (in the case of
 	// zero conf).
 	ListAliases(ctx context.Context, in *ListAliasesRequest, opts ...grpc.CallOption) (*ListAliasesResponse, error)
+	// LookupHtlc retrieves a final htlc resolution from the database. If the htlc
+	// has no final resolution yet, a NotFound grpc status code is returned.
 	LookupHtlc(ctx context.Context, in *LookupHtlcRequest, opts ...grpc.CallOption) (*LookupHtlcResponse, error)
 }
 
@@ -1701,6 +1703,8 @@ type LightningServer interface {
 	// their confirmed SCID (if it exists) and/or the base SCID (in the case of
 	// zero conf).
 	ListAliases(context.Context, *ListAliasesRequest) (*ListAliasesResponse, error)
+	// LookupHtlc retrieves a final htlc resolution from the database. If the htlc
+	// has no final resolution yet, a NotFound grpc status code is returned.
 	LookupHtlc(context.Context, *LookupHtlcRequest) (*LookupHtlcResponse, error)
 	mustEmbedUnimplementedLightningServer()
 }