diff --git a/lnrpc/rpc.pb.go b/lnrpc/rpc.pb.go
index d37cda941..99ab20b4a 100644
--- a/lnrpc/rpc.pb.go
+++ b/lnrpc/rpc.pb.go
@@ -5206,7 +5206,12 @@ type QueryRoutesRequest struct {
 	//
 	//The fields amt and amt_msat are mutually exclusive.
 	AmtMsat int64 `protobuf:"varint,12,opt,name=amt_msat,json=amtMsat,proto3" json:"amt_msat,omitempty"`
-	/// An optional CLTV delta from the current height that should be used for the timelock of the final hop
+	//*
+	//An optional CLTV delta from the current height that should be used for the
+	//timelock of the final hop. Note that unlike SendPayment, QueryRoutes does
+	//not add any additional block padding on top of final_ctlv_delta. This
+	//padding of a few blocks needs to be added manually or otherwise failures may
+	//happen when a block comes in while the payment is in flight.
 	FinalCltvDelta int32 `protobuf:"varint,4,opt,name=final_cltv_delta,json=finalCltvDelta,proto3" json:"final_cltv_delta,omitempty"`
 	//*
 	//The maximum number of satoshis that will be paid as a fee of the payment.
diff --git a/lnrpc/rpc.proto b/lnrpc/rpc.proto
index 89819c650..923ce067a 100644
--- a/lnrpc/rpc.proto
+++ b/lnrpc/rpc.proto
@@ -1824,7 +1824,13 @@ message QueryRoutesRequest {
 
     reserved 3;
 
-    /// An optional CLTV delta from the current height that should be used for the timelock of the final hop
+    /**
+    An optional CLTV delta from the current height that should be used for the
+    timelock of the final hop. Note that unlike SendPayment, QueryRoutes does
+    not add any additional block padding on top of final_ctlv_delta. This
+    padding of a few blocks needs to be added manually or otherwise failures may
+    happen when a block comes in while the payment is in flight.
+    */
     int32 final_cltv_delta = 4;
 
     /**
diff --git a/lnrpc/rpc.swagger.json b/lnrpc/rpc.swagger.json
index a9fc77bbc..c582b1b78 100644
--- a/lnrpc/rpc.swagger.json
+++ b/lnrpc/rpc.swagger.json
@@ -748,7 +748,7 @@
           },
           {
             "name": "final_cltv_delta",
-            "description": "/ An optional CLTV delta from the current height that should be used for the timelock of the final hop.",
+            "description": "*\nAn optional CLTV delta from the current height that should be used for the\ntimelock of the final hop. Note that unlike SendPayment, QueryRoutes does\nnot add any additional block padding on top of final_ctlv_delta. This\npadding of a few blocks needs to be added manually or otherwise failures may\nhappen when a block comes in while the payment is in flight.",
             "in": "query",
             "required": false,
             "type": "integer",